diff --git a/boards/nordic/nrf54h20dk/Kconfig.defconfig b/boards/nordic/nrf54h20dk/Kconfig.defconfig
index 069ed7b6eba..c11d3ef63e1 100644
--- a/boards/nordic/nrf54h20dk/Kconfig.defconfig
+++ b/boards/nordic/nrf54h20dk/Kconfig.defconfig
@@ -13,6 +13,7 @@ config MAX_THREAD_BYTES
 	default 3 if USERSPACE
 
 config ROM_START_OFFSET
+	default 0 if NCS_MCUBOOT_BOOTLOADER_SIGN_MERGED_BINARY
 	default 0x800 if BOOTLOADER_MCUBOOT
 
 if !USE_DT_CODE_PARTITION
@@ -39,6 +40,7 @@ config MAX_THREAD_BYTES
 	default 3 if USERSPACE
 
 config ROM_START_OFFSET
+	default 0 if NCS_MCUBOOT_BOOTLOADER_SIGN_MERGED_BINARY
 	default 0x800 if BOOTLOADER_MCUBOOT
 
 endif # BOARD_NRF54H20DK_NRF54H20_CPURAD
diff --git a/soc/nordic/nrf54h/soc.c b/soc/nordic/nrf54h/soc.c
index 44c3a5314fa..c291767d090 100644
--- a/soc/nordic/nrf54h/soc.c
+++ b/soc/nordic/nrf54h/soc.c
@@ -36,6 +36,12 @@ LOG_MODULE_REGISTER(soc, CONFIG_SOC_LOG_LEVEL);
 #define HSFLL_NODE DT_NODELABEL(cpurad_hsfll)
 #endif
 
+#define FIXED_PARTITION_ADDRESS(label)                                                             \
+	(DT_REG_ADDR(DT_NODELABEL(label)) +                                                        \
+	 DT_REG_ADDR(COND_CODE_1(DT_FIXED_SUBPARTITION_EXISTS(DT_NODELABEL(label)),                \
+			(DT_GPARENT(DT_PARENT(DT_NODELABEL(label)))),                              \
+			(DT_GPARENT(DT_NODELABEL(label))))))
+
 #ifdef CONFIG_USE_DT_CODE_PARTITION
 #define FLASH_LOAD_OFFSET DT_REG_ADDR(DT_CHOSEN(zephyr_code_partition))
 #elif defined(CONFIG_FLASH_LOAD_OFFSET)
@@ -43,7 +49,8 @@ LOG_MODULE_REGISTER(soc, CONFIG_SOC_LOG_LEVEL);
 #endif
 
 #define PARTITION_IS_RUNNING_APP_PARTITION(label)                                                  \
-	(DT_REG_ADDR(DT_NODELABEL(label)) == FLASH_LOAD_OFFSET)
+	(DT_REG_ADDR(DT_NODELABEL(label)) <= FLASH_LOAD_OFFSET &&                                  \
+	 DT_REG_ADDR(DT_NODELABEL(label)) + DT_REG_SIZE(DT_NODELABEL(label)) > FLASH_LOAD_OFFSET)
 
 sys_snode_t soc_node;
 
@@ -203,22 +210,16 @@ void soc_late_init_hook(void)
 	void *radiocore_address = NULL;
 
 #if DT_NODE_EXISTS(DT_NODELABEL(cpurad_slot1_partition))
-	if (PARTITION_IS_RUNNING_APP_PARTITION(slot1_partition)) {
-		radiocore_address =
-			(void *)(DT_REG_ADDR(DT_GPARENT(DT_NODELABEL(cpurad_slot1_partition))) +
-				 DT_REG_ADDR(DT_NODELABEL(cpurad_slot1_partition)) +
-				 CONFIG_ROM_START_OFFSET);
+	if (PARTITION_IS_RUNNING_APP_PARTITION(cpuapp_slot1_partition)) {
+		radiocore_address = (void *)(FIXED_PARTITION_ADDRESS(cpurad_slot1_partition) +
+					     CONFIG_ROM_START_OFFSET);
 	} else {
-		radiocore_address =
-			(void *)(DT_REG_ADDR(DT_GPARENT(DT_NODELABEL(cpurad_slot0_partition))) +
-				 DT_REG_ADDR(DT_NODELABEL(cpurad_slot0_partition)) +
-				 CONFIG_ROM_START_OFFSET);
+		radiocore_address = (void *)(FIXED_PARTITION_ADDRESS(cpurad_slot0_partition) +
+					     CONFIG_ROM_START_OFFSET);
 	}
 #else
 	radiocore_address =
-		(void *)(DT_REG_ADDR(DT_GPARENT(DT_NODELABEL(cpurad_slot0_partition))) +
-			 DT_REG_ADDR(DT_NODELABEL(cpurad_slot0_partition)) +
-			 CONFIG_ROM_START_OFFSET);
+		(void *)(FIXED_PARTITION_ADDRESS(cpurad_slot0_partition) + CONFIG_ROM_START_OFFSET);
 #endif
 
 	if (IS_ENABLED(CONFIG_SOC_NRF54H20_CPURAD_ENABLE_CHECK_VTOR) &&
diff --git a/subsys/dfu/img_util/flash_img.c b/subsys/dfu/img_util/flash_img.c
index 83eb013c661..24e95a8dc1a 100644
--- a/subsys/dfu/img_util/flash_img.c
+++ b/subsys/dfu/img_util/flash_img.c
@@ -23,8 +23,9 @@ LOG_MODULE_REGISTER(flash_img, CONFIG_IMG_MANAGER_LOG_LEVEL);
 #include <bootutil/bootutil_public.h>
 #endif
 
-#define FIXED_PARTITION_IS_RUNNING_APP_PARTITION(label) \
-	(FIXED_PARTITION_OFFSET(label) == CONFIG_FLASH_LOAD_OFFSET)
+#define FIXED_PARTITION_IS_RUNNING_APP_PARTITION(label)                                            \
+	(FIXED_PARTITION_OFFSET(label) <= CONFIG_FLASH_LOAD_OFFSET &&                              \
+	 FIXED_PARTITION_OFFSET(label) + FIXED_PARTITION_SIZE(label) > CONFIG_FLASH_LOAD_OFFSET)
 
 #include <zephyr/devicetree.h>
 #if defined(CONFIG_TRUSTED_EXECUTION_NONSECURE) && (CONFIG_TFM_MCUBOOT_IMAGE_NUMBER == 2)
diff --git a/subsys/mgmt/mcumgr/grp/img_mgmt/src/img_mgmt.c b/subsys/mgmt/mcumgr/grp/img_mgmt/src/img_mgmt.c
index 05e3a9c6488..0bbb583cde9 100644
--- a/subsys/mgmt/mcumgr/grp/img_mgmt/src/img_mgmt.c
+++ b/subsys/mgmt/mcumgr/grp/img_mgmt/src/img_mgmt.c
@@ -65,8 +65,9 @@ BUILD_ASSERT(PM_MCUBOOT_PAD_SIZE == PM_MCUBOOT_SECONDARY_PAD_SIZE);
 	to be able to figure out application running slot.
 #endif
 
-#define FIXED_PARTITION_IS_RUNNING_APP_PARTITION(label)	\
-	 (FIXED_PARTITION_OFFSET(label) == CONFIG_FLASH_LOAD_OFFSET)
+#define FIXED_PARTITION_IS_RUNNING_APP_PARTITION(label)                                            \
+	(FIXED_PARTITION_OFFSET(label) <= CONFIG_FLASH_LOAD_OFFSET &&                              \
+	 FIXED_PARTITION_OFFSET(label) + FIXED_PARTITION_SIZE(label) > CONFIG_FLASH_LOAD_OFFSET)
 #endif /* USE_PARTITION_MANAGER */
 
 BUILD_ASSERT(sizeof(struct image_header) == IMAGE_HEADER_SIZE,
diff --git a/tests/subsys/dfu/img_util/src/main.c b/tests/subsys/dfu/img_util/src/main.c
index dc7c4672126..33956be6251 100644
--- a/tests/subsys/dfu/img_util/src/main.c
+++ b/tests/subsys/dfu/img_util/src/main.c
@@ -12,8 +12,9 @@
 #define SLOT0_PARTITION		slot0_partition
 #define SLOT1_PARTITION		slot1_partition
 
-#define FIXED_PARTITION_IS_RUNNING_APP_PARTITION(label) \
-	(FIXED_PARTITION_OFFSET(label) == CONFIG_FLASH_LOAD_OFFSET)
+#define FIXED_PARTITION_IS_RUNNING_APP_PARTITION(label)                                            \
+	(FIXED_PARTITION_OFFSET(label) <= CONFIG_FLASH_LOAD_OFFSET &&                              \
+	 FIXED_PARTITION_OFFSET(label) + FIXED_PARTITION_SIZE(label) > CONFIG_FLASH_LOAD_OFFSET)
 
 #if FIXED_PARTITION_IS_RUNNING_APP_PARTITION(slot0_partition)
 #define UPLOAD_PARTITION_ID	FIXED_PARTITION_ID(SLOT1_PARTITION)