diff --git a/doc/releases/migration-guide-3.7.rst b/doc/releases/migration-guide-3.7.rst
index 762e581dece..8eaed64cb5e 100644
--- a/doc/releases/migration-guide-3.7.rst
+++ b/doc/releases/migration-guide-3.7.rst
@@ -378,6 +378,13 @@ Networking
   ``CONFIG_NET_TCP_RETRY_COUNT`` instead to control the total timeout at the
   TCP level. (:github:`70731`)
 
+* In LwM2M API, the callback type :c:type:`lwm2m_engine_set_data_cb_t` has now an additional
+  parameter ``offset``. This parameter is used to indicate the offset of the data
+  during a Coap Block-wise transfer. Any post write, validate or some firmware callbacks
+  should be updated to include this parameter. (:github:`72590`)
+
+
+
 Other Subsystems
 ****************
 
diff --git a/doc/releases/release-notes-3.7.rst b/doc/releases/release-notes-3.7.rst
index ce4215db4a3..12c90c0298b 100644
--- a/doc/releases/release-notes-3.7.rst
+++ b/doc/releases/release-notes-3.7.rst
@@ -287,6 +287,9 @@ Networking
 
     * :c:func:`lwm2m_set_bulk`
 
+  * Added new ``offset`` parameter to :c:type:`lwm2m_engine_set_data_cb_t` callback type.
+    This affects post write and validate callbacks as well as some firmware callbacks.
+
 * IPSP:
 
   * Removed IPSP support. ``CONFIG_NET_L2_BT`` does not exist anymore.
diff --git a/include/zephyr/net/lwm2m.h b/include/zephyr/net/lwm2m.h
index e68f5fb47ad..68a5ef9617e 100644
--- a/include/zephyr/net/lwm2m.h
+++ b/include/zephyr/net/lwm2m.h
@@ -329,6 +329,10 @@ typedef void *(*lwm2m_engine_get_data_cb_t)(uint16_t obj_inst_id,
  * make use of this callback to pass the data back to the client or LwM2M
  * objects.
  *
+ * On a block-wise transfers the handler is called multiple times with the data blocks
+ * and increasing offset. The last block has the last_block flag set to true.
+ * Beginning of the block transfer has the offset set to 0.
+ *
  * A function of this type can be registered via:
  * lwm2m_engine_register_validate_callback()
  * lwm2m_engine_register_post_write_callback()
@@ -344,6 +348,7 @@ typedef void *(*lwm2m_engine_get_data_cb_t)(uint16_t obj_inst_id,
  *                       false.
  * @param[in] total_size Expected total size of data for a block transfer.
  *                       For non-block transfers this is 0.
+ * @param[in] offset Offset of the data block. For non-block transfers this is always 0.
  *
  * @return Callback returns a negative error code (errno.h) indicating
  *         reason of failure or 0 for success.
@@ -351,7 +356,7 @@ typedef void *(*lwm2m_engine_get_data_cb_t)(uint16_t obj_inst_id,
 typedef int (*lwm2m_engine_set_data_cb_t)(uint16_t obj_inst_id,
 					  uint16_t res_id, uint16_t res_inst_id,
 					  uint8_t *data, uint16_t data_len,
-					  bool last_block, size_t total_size);
+					  bool last_block, size_t total_size, size_t offset);
 
 /**
  * @brief Asynchronous event notification callback.
diff --git a/samples/net/lwm2m_client/src/firmware_update.c b/samples/net/lwm2m_client/src/firmware_update.c
index dd6dcd8d599..5ef2e1cf127 100644
--- a/samples/net/lwm2m_client/src/firmware_update.c
+++ b/samples/net/lwm2m_client/src/firmware_update.c
@@ -38,13 +38,13 @@ static void *firmware_get_buf(uint16_t obj_inst_id, uint16_t res_id,
 	return firmware_buf;
 }
 
-static int firmware_block_received_cb(uint16_t obj_inst_id,
-				      uint16_t res_id, uint16_t res_inst_id,
-				      uint8_t *data, uint16_t data_len,
-				      bool last_block, size_t total_size)
+static int firmware_block_received_cb(uint16_t obj_inst_id, uint16_t res_id,
+				      uint16_t res_inst_id, uint8_t *data,
+				      uint16_t data_len, bool last_block,
+				      size_t total_size, size_t offset)
 {
-	LOG_INF("FIRMWARE: BLOCK RECEIVED: len:%u last_block:%d",
-		data_len, last_block);
+	LOG_INF("FIRMWARE: BLOCK RECEIVED: offset:%zd len:%u last_block:%d",
+		offset, data_len, last_block);
 	return 0;
 }
 
diff --git a/samples/net/lwm2m_client/src/led.c b/samples/net/lwm2m_client/src/led.c
index 98055baa580..d4aa6388890 100644
--- a/samples/net/lwm2m_client/src/led.c
+++ b/samples/net/lwm2m_client/src/led.c
@@ -22,7 +22,7 @@ static uint32_t led_state;
 
 /* TODO: Move to a pre write hook that can handle ret codes once available */
 static int led_on_off_cb(uint16_t obj_inst_id, uint16_t res_id, uint16_t res_inst_id, uint8_t *data,
-			 uint16_t data_len, bool last_block, size_t total_size)
+			 uint16_t data_len, bool last_block, size_t total_size, size_t offset)
 {
 	int ret = 0;
 	uint32_t led_val;
diff --git a/samples/net/lwm2m_client/src/timer.c b/samples/net/lwm2m_client/src/timer.c
index 17814ae134c..86107451344 100644
--- a/samples/net/lwm2m_client/src/timer.c
+++ b/samples/net/lwm2m_client/src/timer.c
@@ -17,7 +17,7 @@ LOG_MODULE_REGISTER(LOG_MODULE_NAME);
 /* An example data validation callback. */
 static int timer_on_off_validate_cb(uint16_t obj_inst_id, uint16_t res_id, uint16_t res_inst_id,
 				    uint8_t *data, uint16_t data_len, bool last_block,
-				    size_t total_size)
+				    size_t total_size, size_t offset)
 {
 	LOG_INF("Validating On/Off data");
 
@@ -34,7 +34,7 @@ static int timer_on_off_validate_cb(uint16_t obj_inst_id, uint16_t res_id, uint1
 
 static int timer_digital_state_cb(uint16_t obj_inst_id, uint16_t res_id, uint16_t res_inst_id,
 				  uint8_t *data, uint16_t data_len, bool last_block,
-				  size_t total_size)
+				  size_t total_size, size_t offset)
 {
 	bool *digital_state = (bool *)data;
 
diff --git a/subsys/net/lib/lwm2m/ipso_buzzer.c b/subsys/net/lib/lwm2m/ipso_buzzer.c
index f679d7e4a60..c44df2c5431 100644
--- a/subsys/net/lib/lwm2m/ipso_buzzer.c
+++ b/subsys/net/lib/lwm2m/ipso_buzzer.c
@@ -144,10 +144,10 @@ static int stop_buzzer(struct ipso_buzzer_data *buzzer, bool cancel)
 	return 0;
 }
 
-static int onoff_post_write_cb(uint16_t obj_inst_id,
-			       uint16_t res_id, uint16_t res_inst_id,
-			       uint8_t *data, uint16_t data_len,
-			       bool last_block, size_t total_size)
+static int onoff_post_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+			       uint16_t res_inst_id, uint8_t *data,
+			       uint16_t data_len, bool last_block,
+			       size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_current_sensor.c b/subsys/net/lib/lwm2m/ipso_current_sensor.c
index 1268b7da56d..bfe713a1cbe 100644
--- a/subsys/net/lib/lwm2m/ipso_current_sensor.c
+++ b/subsys/net/lib/lwm2m/ipso_current_sensor.c
@@ -112,7 +112,7 @@ static int reset_min_max_measured_values_cb(uint16_t obj_inst_id,
 static int sensor_value_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 				 uint16_t res_inst_id, uint8_t *data,
 				 uint16_t data_len, bool last_block,
-				 size_t total_size)
+				 size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_filling_sensor.c b/subsys/net/lib/lwm2m/ipso_filling_sensor.c
index 96944e0c16a..9fae4cfeb25 100644
--- a/subsys/net/lib/lwm2m/ipso_filling_sensor.c
+++ b/subsys/net/lib/lwm2m/ipso_filling_sensor.c
@@ -121,7 +121,7 @@ static void update(uint16_t obj_inst_id, uint16_t res_id, int index)
 
 static int update_cb(uint16_t obj_inst_id, uint16_t res_id,
 		     uint16_t res_inst_id, uint8_t *data, uint16_t data_len,
-		     bool last_block, size_t total_size)
+		     bool last_block, size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_generic_sensor.c b/subsys/net/lib/lwm2m/ipso_generic_sensor.c
index 05a1afc9806..2b5381d564c 100644
--- a/subsys/net/lib/lwm2m/ipso_generic_sensor.c
+++ b/subsys/net/lib/lwm2m/ipso_generic_sensor.c
@@ -121,7 +121,7 @@ static int reset_min_max_measured_values_cb(uint16_t obj_inst_id,
 static int sensor_value_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 				 uint16_t res_inst_id, uint8_t *data,
 				 uint16_t data_len, bool last_block,
-				 size_t total_size)
+				 size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_humidity_sensor.c b/subsys/net/lib/lwm2m/ipso_humidity_sensor.c
index b2d147060a0..85bb2335c2e 100644
--- a/subsys/net/lib/lwm2m/ipso_humidity_sensor.c
+++ b/subsys/net/lib/lwm2m/ipso_humidity_sensor.c
@@ -107,7 +107,7 @@ static int reset_min_max_measured_values_cb(uint16_t obj_inst_id,
 static int sensor_value_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 				 uint16_t res_inst_id, uint8_t *data,
 				 uint16_t data_len, bool last_block,
-				 size_t total_size)
+				 size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_light_control.c b/subsys/net/lib/lwm2m/ipso_light_control.c
index 55b9f7728ca..883dece531d 100644
--- a/subsys/net/lib/lwm2m/ipso_light_control.c
+++ b/subsys/net/lib/lwm2m/ipso_light_control.c
@@ -88,10 +88,10 @@ static void *on_time_read_cb(uint16_t obj_inst_id, uint16_t res_id, uint16_t res
 	return NULL;
 }
 
-static int on_time_post_write_cb(uint16_t obj_inst_id,
-				 uint16_t res_id, uint16_t res_inst_id,
-				 uint8_t *data, uint16_t data_len,
-				 bool last_block, size_t total_size)
+static int on_time_post_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+				 uint16_t res_inst_id, uint8_t *data,
+				 uint16_t data_len, bool last_block,
+				 size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_onoff_switch.c b/subsys/net/lib/lwm2m/ipso_onoff_switch.c
index 3da496b2ca1..da1cf464d83 100644
--- a/subsys/net/lib/lwm2m/ipso_onoff_switch.c
+++ b/subsys/net/lib/lwm2m/ipso_onoff_switch.c
@@ -87,10 +87,10 @@ static int get_switch_index(uint16_t obj_inst_id)
 	return ret;
 }
 
-static int state_post_write_cb(uint16_t obj_inst_id,
-			       uint16_t res_id, uint16_t res_inst_id,
-			       uint8_t *data, uint16_t data_len,
-			       bool last_block, size_t total_size)
+static int state_post_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+			       uint16_t res_inst_id, uint8_t *data,
+			       uint16_t data_len, bool last_block,
+			       size_t total_size, size_t offset)
 {
 	int i;
 
@@ -157,10 +157,10 @@ static void *off_time_read_cb(uint16_t obj_inst_id,
 	return &switch_data[i].off_time_sec;
 }
 
-static int time_post_write_cb(uint16_t obj_inst_id,
-			      uint16_t res_id, uint16_t res_inst_id,
-			      uint8_t *data, uint16_t data_len,
-			      bool last_block, size_t total_size)
+static int time_post_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+			      uint16_t res_inst_id, uint8_t *data,
+			      uint16_t data_len, bool last_block,
+			      size_t total_size, size_t offset)
 {
 	int i = get_switch_index(obj_inst_id);
 
diff --git a/subsys/net/lib/lwm2m/ipso_pressure_sensor.c b/subsys/net/lib/lwm2m/ipso_pressure_sensor.c
index 7dca2ed3956..f6b59591d7d 100644
--- a/subsys/net/lib/lwm2m/ipso_pressure_sensor.c
+++ b/subsys/net/lib/lwm2m/ipso_pressure_sensor.c
@@ -108,7 +108,7 @@ static int reset_min_max_measured_values_cb(uint16_t obj_inst_id,
 static int sensor_value_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 				 uint16_t res_inst_id, uint8_t *data,
 				 uint16_t data_len, bool last_block,
-				 size_t total_size)
+				 size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_push_button.c b/subsys/net/lib/lwm2m/ipso_push_button.c
index 07782a86756..475363a75ef 100644
--- a/subsys/net/lib/lwm2m/ipso_push_button.c
+++ b/subsys/net/lib/lwm2m/ipso_push_button.c
@@ -82,10 +82,10 @@ static int get_button_index(uint16_t obj_inst_id)
 	return ret;
 }
 
-static int state_post_write_cb(uint16_t obj_inst_id,
-			       uint16_t res_id, uint16_t res_inst_id,
-			       uint8_t *data, uint16_t data_len,
-			       bool last_block, size_t total_size)
+static int state_post_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+			       uint16_t res_inst_id, uint8_t *data,
+			       uint16_t data_len, bool last_block,
+			       size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_temp_sensor.c b/subsys/net/lib/lwm2m/ipso_temp_sensor.c
index ba843db0ebd..6d258b9d5fb 100644
--- a/subsys/net/lib/lwm2m/ipso_temp_sensor.c
+++ b/subsys/net/lib/lwm2m/ipso_temp_sensor.c
@@ -107,10 +107,10 @@ static int reset_min_max_measured_values_cb(uint16_t obj_inst_id,
 	return -ENOENT;
 }
 
-static int sensor_value_write_cb(uint16_t obj_inst_id,
-				 uint16_t res_id, uint16_t res_inst_id,
-				 uint8_t *data, uint16_t data_len,
-				 bool last_block, size_t total_size)
+static int sensor_value_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+				 uint16_t res_inst_id, uint8_t *data,
+				 uint16_t data_len, bool last_block,
+				 size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_timer.c b/subsys/net/lib/lwm2m/ipso_timer.c
index 833002e56c4..cf4798d7456 100644
--- a/subsys/net/lib/lwm2m/ipso_timer.c
+++ b/subsys/net/lib/lwm2m/ipso_timer.c
@@ -200,9 +200,10 @@ static void *cumulative_time_read_cb(uint16_t obj_inst_id,
 }
 
 static int cumulative_time_post_write_cb(uint16_t obj_inst_id,
-					 uint16_t res_id, uint16_t res_inst_id,
-					 uint8_t *data, uint16_t data_len,
-					 bool last_block, size_t total_size)
+					 uint16_t res_id,
+					 uint16_t res_inst_id, uint8_t *data,
+					 uint16_t data_len, bool last_block,
+					 size_t total_size, size_t offset)
 {
 	int i;
 
@@ -215,10 +216,10 @@ static int cumulative_time_post_write_cb(uint16_t obj_inst_id,
 	return 0;
 }
 
-static int enabled_post_write_cb(uint16_t obj_inst_id,
-				 uint16_t res_id, uint16_t res_inst_id,
-				 uint8_t *data, uint16_t data_len,
-				 bool last_block, size_t total_size)
+static int enabled_post_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+				 uint16_t res_inst_id, uint8_t *data,
+				 uint16_t data_len, bool last_block,
+				 size_t total_size, size_t offset)
 {
 	int i;
 
@@ -236,9 +237,10 @@ static int enabled_post_write_cb(uint16_t obj_inst_id,
 }
 
 static int trigger_counter_post_write_cb(uint16_t obj_inst_id,
-					 uint16_t res_id, uint16_t res_inst_id,
-					 uint8_t *data, uint16_t data_len,
-					 bool last_block, size_t total_size)
+					 uint16_t res_id,
+					 uint16_t res_inst_id, uint8_t *data,
+					 uint16_t data_len, bool last_block,
+					 size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/ipso_voltage_sensor.c b/subsys/net/lib/lwm2m/ipso_voltage_sensor.c
index ec1274d07ff..87fb1b83761 100644
--- a/subsys/net/lib/lwm2m/ipso_voltage_sensor.c
+++ b/subsys/net/lib/lwm2m/ipso_voltage_sensor.c
@@ -113,7 +113,7 @@ static int reset_min_max_measured_values_cb(uint16_t obj_inst_id,
 static int sensor_value_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 				 uint16_t res_inst_id, uint8_t *data,
 				 uint16_t data_len, bool last_block,
-				 size_t total_size)
+				 size_t total_size, size_t offset)
 {
 	int i;
 
diff --git a/subsys/net/lib/lwm2m/lwm2m_message_handling.c b/subsys/net/lib/lwm2m/lwm2m_message_handling.c
index 3596f432476..462ed32fafd 100644
--- a/subsys/net/lib/lwm2m/lwm2m_message_handling.c
+++ b/subsys/net/lib/lwm2m/lwm2m_message_handling.c
@@ -984,7 +984,8 @@ static int lwm2m_write_handler_opaque(struct lwm2m_engine_obj_inst *obj_inst,
 		if (res->validate_cb) {
 			ret = res->validate_cb(obj_inst->obj_inst_id, res->res_id,
 					       res_inst->res_inst_id, write_buf, len,
-					       last_pkt_block && last_block, opaque_ctx.len);
+					       last_pkt_block && last_block, opaque_ctx.len,
+					       msg->in.block_ctx->ctx.current);
 			if (ret < 0) {
 				/* -EEXIST will generate Bad Request LWM2M response. */
 				return -EEXIST;
@@ -997,11 +998,15 @@ static int lwm2m_write_handler_opaque(struct lwm2m_engine_obj_inst *obj_inst,
 		if (res->post_write_cb) {
 			ret = res->post_write_cb(obj_inst->obj_inst_id, res->res_id,
 						 res_inst->res_inst_id, data_ptr, len,
-						 last_pkt_block && last_block, opaque_ctx.len);
+						 last_pkt_block && last_block, opaque_ctx.len,
+						 msg->in.block_ctx->ctx.current);
 			if (ret < 0) {
 				return ret;
 			}
 		}
+		if (msg->in.block_ctx) {
+			msg->in.block_ctx->ctx.current += len;
+		}
 	}
 
 	if (msg->in.block_ctx != NULL) {
@@ -1200,11 +1205,13 @@ int lwm2m_write_handler(struct lwm2m_engine_obj_inst *obj_inst, struct lwm2m_eng
 	}
 
 	if (obj_field->data_type != LWM2M_RES_TYPE_OPAQUE) {
+		size_t offset = msg->in.block_ctx ? msg->in.block_ctx->ctx.current : 0;
+
 #if CONFIG_LWM2M_ENGINE_VALIDATION_BUFFER_SIZE > 0
 		if (res->validate_cb) {
 			ret = res->validate_cb(obj_inst->obj_inst_id, res->res_id,
 					       res_inst->res_inst_id, write_buf, len, last_block,
-					       total_size);
+					       total_size, offset);
 			if (ret < 0) {
 				/* -EEXIST will generate Bad Request LWM2M response. */
 				return -EEXIST;
@@ -1227,7 +1234,7 @@ int lwm2m_write_handler(struct lwm2m_engine_obj_inst *obj_inst, struct lwm2m_eng
 		if (res->post_write_cb) {
 			ret = res->post_write_cb(obj_inst->obj_inst_id, res->res_id,
 						 res_inst->res_inst_id, data_ptr, len, last_block,
-						 total_size);
+						 total_size, offset);
 		}
 	}
 
diff --git a/subsys/net/lib/lwm2m/lwm2m_obj_access_control.c b/subsys/net/lib/lwm2m/lwm2m_obj_access_control.c
index e5eb8c56efb..287be88f726 100644
--- a/subsys/net/lib/lwm2m/lwm2m_obj_access_control.c
+++ b/subsys/net/lib/lwm2m/lwm2m_obj_access_control.c
@@ -335,8 +335,10 @@ static void add_existing_objects(void)
 	}
 }
 
-static int write_validate_cb(uint16_t obj_inst_id, uint16_t res_id, uint16_t res_inst_id,
-			     uint8_t *data, uint16_t data_len, bool last_block, size_t total_size)
+static int write_validate_cb(uint16_t obj_inst_id, uint16_t res_id,
+			     uint16_t res_inst_id, uint8_t *data,
+			     uint16_t data_len, bool last_block,
+			     size_t total_size, size_t offset)
 {
 	/* validates and removes acl instances for non-existing servers */
 
diff --git a/subsys/net/lib/lwm2m/lwm2m_obj_device.c b/subsys/net/lib/lwm2m/lwm2m_obj_device.c
index cdebef24532..208423eb04a 100644
--- a/subsys/net/lib/lwm2m/lwm2m_obj_device.c
+++ b/subsys/net/lib/lwm2m/lwm2m_obj_device.c
@@ -190,9 +190,9 @@ static void *current_time_pre_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 }
 
 static int current_time_post_write_cb(uint16_t obj_inst_id, uint16_t res_id,
-				      uint16_t res_inst_id,
-				      uint8_t *data, uint16_t data_len,
-				      bool last_block, size_t total_size)
+				      uint16_t res_inst_id, uint8_t *data,
+				      uint16_t data_len, bool last_block,
+				      size_t total_size, size_t offset)
 {
 	if (data_len == 4U) {
 		time_offset = *(uint32_t *)data - k_uptime_seconds();
diff --git a/subsys/net/lib/lwm2m/lwm2m_obj_firmware.c b/subsys/net/lib/lwm2m/lwm2m_obj_firmware.c
index ad313163548..1ba3789f1cf 100644
--- a/subsys/net/lib/lwm2m/lwm2m_obj_firmware.c
+++ b/subsys/net/lib/lwm2m/lwm2m_obj_firmware.c
@@ -235,8 +235,9 @@ void lwm2m_firmware_set_update_result(uint8_t result)
 }
 
 static int package_write_cb(uint16_t obj_inst_id, uint16_t res_id,
-			    uint16_t res_inst_id, uint8_t *data, uint16_t data_len,
-			    bool last_block, size_t total_size)
+			    uint16_t res_inst_id, uint8_t *data,
+			    uint16_t data_len, bool last_block,
+			    size_t total_size, size_t offset)
 {
 	uint8_t state;
 	int ret = 0;
@@ -270,7 +271,7 @@ static int package_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 	write_callback = lwm2m_firmware_get_write_cb_inst(obj_inst_id);
 	if (write_callback) {
 		ret = write_callback(obj_inst_id, res_id, res_inst_id, data, data_len, last_block,
-				     total_size);
+				     total_size, offset);
 	}
 
 	if (ret >= 0) {
@@ -298,8 +299,9 @@ static int package_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 }
 
 static int package_uri_write_cb(uint16_t obj_inst_id, uint16_t res_id,
-				uint16_t res_inst_id, uint8_t *data, uint16_t data_len,
-				bool last_block, size_t total_size)
+				uint16_t res_inst_id, uint8_t *data,
+				uint16_t data_len, bool last_block,
+				size_t total_size, size_t offset)
 {
 	LOG_DBG("PACKAGE_URI WRITE: %s", package_uri[obj_inst_id]);
 
diff --git a/subsys/net/lib/lwm2m/lwm2m_obj_gateway.c b/subsys/net/lib/lwm2m/lwm2m_obj_gateway.c
index 106ef951653..fb82fe6c3f5 100644
--- a/subsys/net/lib/lwm2m/lwm2m_obj_gateway.c
+++ b/subsys/net/lib/lwm2m/lwm2m_obj_gateway.c
@@ -61,9 +61,10 @@ static struct lwm2m_engine_res res[MAX_INSTANCE_COUNT][GATEWAY_MAX_ID];
 static struct lwm2m_engine_res_inst res_inst[MAX_INSTANCE_COUNT][RESOURCE_INSTANCE_COUNT];
 lwm2m_engine_gateway_msg_cb gateway_msg_cb[MAX_INSTANCE_COUNT];
 
-static int prefix_validation_cb(uint16_t obj_inst_id, uint16_t res_id, uint16_t res_inst_id,
-				uint8_t *data, uint16_t data_len, bool last_block,
-				size_t total_size)
+static int prefix_validation_cb(uint16_t obj_inst_id, uint16_t res_id,
+				uint16_t res_inst_id, uint8_t *data,
+				uint16_t data_len, bool last_block,
+				size_t total_size, size_t offset)
 {
 	int i;
 	int length;
diff --git a/subsys/net/lib/lwm2m/lwm2m_obj_server.c b/subsys/net/lib/lwm2m/lwm2m_obj_server.c
index a7d3e541bbe..9c1dfc0ca1d 100644
--- a/subsys/net/lib/lwm2m/lwm2m_obj_server.c
+++ b/subsys/net/lib/lwm2m/lwm2m_obj_server.c
@@ -146,7 +146,7 @@ bool lwm2m_server_get_mute_send(uint16_t obj_inst_id)
 static int lifetime_write_cb(uint16_t obj_inst_id, uint16_t res_id,
 			     uint16_t res_inst_id, uint8_t *data,
 			     uint16_t data_len, bool last_block,
-			     size_t total_size)
+			     size_t total_size, size_t offset)
 {
 	ARG_UNUSED(obj_inst_id);
 	ARG_UNUSED(res_id);
diff --git a/subsys/net/lib/lwm2m/lwm2m_obj_swmgmt.c b/subsys/net/lib/lwm2m/lwm2m_obj_swmgmt.c
index f1466be6c87..69dfd5c1f8c 100644
--- a/subsys/net/lib/lwm2m/lwm2m_obj_swmgmt.c
+++ b/subsys/net/lib/lwm2m/lwm2m_obj_swmgmt.c
@@ -187,9 +187,10 @@ static int callback_execute_not_defined(uint16_t obj_inst_id, uint8_t *args, uin
 	return -EINVAL;
 }
 
-static int callback_write_not_defined(uint16_t obj_inst_id, uint16_t res_id, uint16_t res_inst_id,
-				      uint8_t *data, uint16_t data_len, bool last_block,
-				      size_t total_size)
+static int callback_write_not_defined(uint16_t obj_inst_id, uint16_t res_id,
+				      uint16_t res_inst_id, uint8_t *data,
+				      uint16_t data_len, bool last_block,
+				      size_t total_size, size_t offset)
 {
 	LOG_ERR("Callback not defined for inst %u", obj_inst_id);
 	return -EINVAL;
@@ -558,8 +559,10 @@ static int deactivate_cb(uint16_t obj_inst_id, uint8_t *args, uint16_t args_len)
 	return handle_event(instance, EVENT_DEACTIVATE);
 }
 
-static int package_write_cb(uint16_t obj_inst_id, uint16_t res_id, uint16_t res_inst_id,
-			    uint8_t *data, uint16_t data_len, bool last_block, size_t total_size)
+static int package_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+			    uint16_t res_inst_id, uint8_t *data,
+			    uint16_t data_len, bool last_block,
+			    size_t total_size, size_t offset)
 {
 	int ret = -EINVAL;
 	struct lwm2m_swmgmt_data *instance = NULL;
@@ -643,9 +646,10 @@ static void set_update_result(uint16_t obj_inst_id, int error_code)
 	}
 }
 
-static int package_uri_write_cb(uint16_t obj_inst_id, uint16_t res_id, uint16_t res_inst_id,
-				uint8_t *data, uint16_t data_len, bool last_block,
-				size_t total_size)
+static int package_uri_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+				uint16_t res_inst_id, uint8_t *data,
+				uint16_t data_len, bool last_block,
+				size_t total_size, size_t offset)
 {
 #ifdef CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_SUPPORT
 	int error_code;
diff --git a/subsys/net/lib/lwm2m/lwm2m_pull_context.c b/subsys/net/lib/lwm2m/lwm2m_pull_context.c
index e1eac08554f..c4c782d538f 100644
--- a/subsys/net/lib/lwm2m/lwm2m_pull_context.c
+++ b/subsys/net/lib/lwm2m/lwm2m_pull_context.c
@@ -303,6 +303,8 @@ static int do_firmware_transfer_reply_cb(const struct coap_packet *response,
 		}
 
 		if (context.write_cb) {
+			size_t offset = context.block_ctx.current;
+
 			/* flush incoming data to write_cb */
 			while (payload_len > 0) {
 				len = (payload_len > write_buflen) ? write_buflen : payload_len;
@@ -317,7 +319,8 @@ static int do_firmware_transfer_reply_cb(const struct coap_packet *response,
 
 				ret = context.write_cb(context.obj_inst_id, 0, 0, write_buf, len,
 						       last_block && (payload_len == 0U),
-						       context.block_ctx.total_size);
+						       context.block_ctx.total_size, offset);
+				offset += len;
 				if (ret < 0) {
 					goto error;
 				}
diff --git a/subsys/net/lib/lwm2m/lwm2m_registry.c b/subsys/net/lib/lwm2m/lwm2m_registry.c
index 3ead504bc94..54bda0a0ca1 100644
--- a/subsys/net/lib/lwm2m/lwm2m_registry.c
+++ b/subsys/net/lib/lwm2m/lwm2m_registry.c
@@ -668,7 +668,7 @@ static int lwm2m_engine_set(const struct lwm2m_obj_path *path, const void *value
 #if CONFIG_LWM2M_ENGINE_VALIDATION_BUFFER_SIZE > 0
 	if (res->validate_cb) {
 		ret = res->validate_cb(obj_inst->obj_inst_id, res->res_id, res_inst->res_inst_id,
-				       (uint8_t *)value, len, false, 0);
+				       (uint8_t *)value, len, false, 0, 0);
 		if (ret < 0) {
 			k_mutex_unlock(&registry_lock);
 			return -EINVAL;
@@ -774,7 +774,7 @@ static int lwm2m_engine_set(const struct lwm2m_obj_path *path, const void *value
 
 	if (res->post_write_cb) {
 		ret = res->post_write_cb(obj_inst->obj_inst_id, res->res_id, res_inst->res_inst_id,
-					 data_ptr, len, false, 0);
+					 data_ptr, len, false, 0, 0);
 	}
 
 	if (changed && LWM2M_HAS_PERM(obj_field, LWM2M_PERM_R)) {
diff --git a/tests/net/lib/lwm2m/lwm2m_registry/src/lwm2m_registry.c b/tests/net/lib/lwm2m/lwm2m_registry/src/lwm2m_registry.c
index 4c193cfd50b..b6178abb17f 100644
--- a/tests/net/lib/lwm2m/lwm2m_registry/src/lwm2m_registry.c
+++ b/tests/net/lib/lwm2m/lwm2m_registry/src/lwm2m_registry.c
@@ -23,10 +23,10 @@ static void *pre_write_cb(uint16_t obj_inst_id,
 	return pre_write_cb_buf;
 }
 
-static int post_write_cb(uint16_t obj_inst_id,
-			 uint16_t res_id, uint16_t res_inst_id,
-			 uint8_t *data, uint16_t data_len,
-			 bool last_block, size_t total_size)
+static int post_write_cb(uint16_t obj_inst_id, uint16_t res_id,
+			 uint16_t res_inst_id, uint8_t *data,
+			 uint16_t data_len, bool last_block,
+			 size_t total_size, size_t offset)
 {
 	callback_checker |= 0x02;
 	return 0;
@@ -41,10 +41,9 @@ static void *read_cb(uint16_t obj_inst_id,
 	return 0;
 }
 
-static int validate_cb(uint16_t obj_inst_id,
-		       uint16_t res_id, uint16_t res_inst_id,
-		       uint8_t *data, uint16_t data_len,
-		       bool last_block, size_t total_size)
+static int validate_cb(uint16_t obj_inst_id, uint16_t res_id,
+		       uint16_t res_inst_id, uint8_t *data, uint16_t data_len,
+		       bool last_block, size_t total_size, size_t offset)
 {
 	callback_checker |= 0x08;
 	return 0;