I have rebuilt the sample app at_client using VS Code (Mac)
nRF Connect SDK v2.6.0 and Toolchain v2.6.0
Board target: thingy91_nrf9151
Snippets: nrf91-modem-trace-uart
I am using nRF Connect for Desktop -> Programmer v4.6.2 to program the device
File: at_client/build/zephyr/dfu_application.zip
When programming I get the following failure:
Message: Failed, Error parsing multi-image file entry: slot_index_primary is required.
Same result if I try to use command line.
Full log:
2025-07-20T21:01:38.782Z INFO Device connected with the serial number THINGY91X_941D1C15D72
2025-07-20T21:01:45.430Z INFO Getting serial port options from the persistent store for THINGY91X_941D1C15D72.pc-nrfconnect-programmer
2025-07-20T21:01:45.431Z INFO Device connected with the serial number THINGY91X_941D1C15D72
2025-07-20T21:01:45.431Z DEBUG Sending event "programmer: device connected"
2025-07-20T21:01:45.657Z INFO Getting serial port options from the persistent store for THINGY91X_941D1C15D72.pc-nrfconnect-programmer
2025-07-20T21:01:45.657Z DEBUG Sending event "programmer: device connected"
2025-07-20T21:01:45.664Z INFO Getting serial port options from the persistent store for THINGY91X_941D1C15D72.pc-nrfconnect-programmer
2025-07-20T21:01:45.664Z DEBUG Sending event "programmer: device connected"
2025-07-20T21:01:56.082Z INFO Selecting device with the serial number THINGY91X_941D1C15D72
2025-07-20T21:01:56.089Z DEBUG Sending event "programmer: running nrfutil device"
2025-07-20T21:01:56.210Z INFO Selected device with the serial number THINGY91X_941D1C15D72
2025-07-20T21:01:56.211Z DEBUG Sending event "programmer: device selected"
2025-07-20T21:02:01.650Z INFO Checking ZIP file: /Users/anders/Sources/thingy91x/at_client/build/zephyr/dfu_application.zip
2025-07-20T21:02:01.650Z INFO File was last modified at 7/18/2025, 12:36:15 PM
2025-07-20T21:02:07.003Z INFO Modem DFU starts to write...
2025-07-20T21:02:07.003Z INFO Writing /Users/anders/Sources/nrf52840dk/at_client/build/zephyr/dfu_application.zip to device THINGY91X_941D1C15D72
2025-07-20T21:02:07.006Z DEBUG Sending event "programmer: running nrfutil device"
2025-07-20T21:02:07.129Z ERROR Error: Failed with exit code 1.
One or more program tasks failed:
* THINGY91X_941D1C15D72: Error parsing multi-image file entry: slot_index_primary is required (FileOpenFailed)
Message: Failed, Error parsing multi-image file entry: slot_index_primary is required.
2025-07-20T21:02:07.129Z ERROR Modem DFU failed with error: Error: Failed with exit code 1.
One or more program tasks failed:
* THINGY91X_941D1C15D72: Error parsing multi-image file entry: slot_index_primary is required (FileOpenFailed)
Message: Failed, Error parsing multi-image file entry: slot_index_primary is required.
