diff --git a/config/nrfconnect/app/copy-flashbundle-firmware.cmake b/config/nrfconnect/app/copy-flashbundle-firmware.cmake
deleted file mode 100644
index 93464f7aceb837..00000000000000
--- a/config/nrfconnect/app/copy-flashbundle-firmware.cmake
+++ /dev/null
@@ -1,25 +0,0 @@
-#
-#   Copyright (c) 2022 Project CHIP Authors
-#
-#   Licensed under the Apache License, Version 2.0 (the "License");
-#   you may not use this file except in compliance with the License.
-#   You may obtain a copy of the License at
-#
-#       http://www.apache.org/licenses/LICENSE-2.0
-#
-#   Unless required by applicable law or agreed to in writing, software
-#   distributed under the License is distributed on an "AS IS" BASIS,
-#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#   See the License for the specific language governing permissions and
-#   limitations under the License.
-#
-
-# Copy the merged.hex file if it exists, otherwise copy zephyr.hex
-
-set(HEX_NAME merged.hex)
-
-if(EXISTS "zephyr/${HEX_NAME}")
-  configure_file("zephyr/${HEX_NAME}" "${FLASHBUNDLE_FIRMWARE}" COPYONLY)
-else()
-  configure_file("zephyr/${KERNEL_HEX_NAME}" "${FLASHBUNDLE_FIRMWARE}" COPYONLY)
-endif()
diff --git a/config/nrfconnect/app/flashing.cmake b/config/nrfconnect/app/flashing.cmake
index b70e166ff28cfe..7937d99d887799 100644
--- a/config/nrfconnect/app/flashing.cmake
+++ b/config/nrfconnect/app/flashing.cmake
@@ -39,10 +39,15 @@ add_custom_command(OUTPUT "${FLASHBUNDLE_FLASHER_PLATFORM}"
     COMMAND ${CMAKE_COMMAND} ARGS -E copy "${PROJECT_SOURCE_DIR}/third_party/connectedhomeip/scripts/flashing/nrfconnect_firmware_utils.py" "${FLASHBUNDLE_FLASHER_PLATFORM}"
     VERBATIM)
 
+if (merged_hex_to_flash)
+  set(flashbundle_hex_to_copy "${merged_hex_to_flash}")
+else()
+  set(flashbundle_hex_to_copy "zephyr/${KERNEL_HEX_NAME}")
+endif()
+
 add_custom_command(OUTPUT "${FLASHBUNDLE_FIRMWARE}"
-    DEPENDS zephyr/${KERNEL_HEX_NAME}
-    COMMAND ${CMAKE_COMMAND} ARGS -DFLASHBUNDLE_FIRMWARE=${FLASHBUNDLE_FIRMWARE} -DKERNEL_HEX_NAME=${KERNEL_HEX_NAME} -P "${CHIP_ROOT}/config/nrfconnect/app/copy-flashbundle-firmware.cmake"
-    VERBATIM)
+    DEPENDS ${flashbundle_hex_to_copy}
+    COMMAND ${CMAKE_COMMAND} -E copy "${flashbundle_hex_to_copy}" "${FLASHBUNDLE_FIRMWARE}")
 
 add_custom_command(OUTPUT "${CMAKE_PROJECT_NAME}/${CMAKE_PROJECT_NAME}.flash.py"
     COMMAND ${python}
diff --git a/config/zephyr/app/flashing.cmake b/config/zephyr/app/flashing.cmake
index b70e166ff28cfe..7937d99d887799 100644
--- a/config/zephyr/app/flashing.cmake
+++ b/config/zephyr/app/flashing.cmake
@@ -39,10 +39,15 @@ add_custom_command(OUTPUT "${FLASHBUNDLE_FLASHER_PLATFORM}"
     COMMAND ${CMAKE_COMMAND} ARGS -E copy "${PROJECT_SOURCE_DIR}/third_party/connectedhomeip/scripts/flashing/nrfconnect_firmware_utils.py" "${FLASHBUNDLE_FLASHER_PLATFORM}"
     VERBATIM)
 
+if (merged_hex_to_flash)
+  set(flashbundle_hex_to_copy "${merged_hex_to_flash}")
+else()
+  set(flashbundle_hex_to_copy "zephyr/${KERNEL_HEX_NAME}")
+endif()
+
 add_custom_command(OUTPUT "${FLASHBUNDLE_FIRMWARE}"
-    DEPENDS zephyr/${KERNEL_HEX_NAME}
-    COMMAND ${CMAKE_COMMAND} ARGS -DFLASHBUNDLE_FIRMWARE=${FLASHBUNDLE_FIRMWARE} -DKERNEL_HEX_NAME=${KERNEL_HEX_NAME} -P "${CHIP_ROOT}/config/nrfconnect/app/copy-flashbundle-firmware.cmake"
-    VERBATIM)
+    DEPENDS ${flashbundle_hex_to_copy}
+    COMMAND ${CMAKE_COMMAND} -E copy "${flashbundle_hex_to_copy}" "${FLASHBUNDLE_FIRMWARE}")
 
 add_custom_command(OUTPUT "${CMAKE_PROJECT_NAME}/${CMAKE_PROJECT_NAME}.flash.py"
     COMMAND ${python}