nRF53 Device is Protected after programming and I cannot debug

[nsga333]

When i program our new nRF5340 based radio boards the program returns Device Protected for both cores on completion. It is also impossible to debug the board as my segger refuses to connect.

I found a case with a similar issue:

https://devzone.nordicsemi.com/f/nordic-q-a/75406/problem-to-debug-net-cpu-after-segger-update-and-new-nrf5340-chip?ReplySortBy=CreatedDate&ReplySortOrder=Descending

and have tried the suggested solution of:

put the following in the NET Code at the start of main:

NRF_UICR_NS->APPROTECT=0x50fa50fa;
NRF_CTRLAP_NS->APPROTECT.DISABLE=0x50fa50fa;

put the following in the  APP Code the start of main:

NRF_UICR_S->APPROTECT=0x50fa50fa;
NRF_CTRLAP_S->APPROTECT.DISABLE=0x50fa50fa;

This does seem to allow the debugger to connect, However i get a hard fault from the command.

Is there a suggested way around this issue?

[emag nioj]

hello thank you!

about nrfjprog

i have this error  ERROR: JLinkARM DLL not found. Please reinstall latest JLinkARM. 

how to reinstall?

this errr after the update.

[Sigurd]

Try uninstall Segger J-link, and then run the nRF Command Line Tools installer again,

https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Command-Line-Tools/Download#infotabs