How to erase a nrf51422 using JLink after flashing a softdevice

[Torsten Robitzki]

Hello, we experience the situation, where we are able to flash a softdevice (s210) once. After the softdevice is flushed, subsequent attempts to flash the softdevice fail with the following error message:

J-Link>loadbin s210_main.bin, 0x00000000
Downloading file [s210_main.bin]...Info: J-Link: Flash download: Total time needed: 24.013s (Prepare: 0.547s, Compare: 10.036s, Erase: 0.185s, Program: 10.170s, Verify: 0.000s, Restore: 3.072s)
Error while programming flash: Programming failed.

My best guess is, that flashing the UICR causes the problem. Is this right? If so, how could the chips flash be erased? (using erase from JLinkExe doesn't work).

Cheers Torsten

[Torsten Robitzki]

I've came up with the followin solution:

halt
exec device = nRF51422_xxAA
w4 4001E504, 2
w4 4001e50C, 1
Sleep 100
r
q

Does this looks resonable?

Edit: Sorry, I've forgot to mention, that the sequence above erases the entire flash.