Reflashing J-Link on nRF51-DK

[Crllo]

Hi everyone,

sadly one of my nRF51-DK boards seems to be terribly bricked. During firmware update nRFgo Studio (on Windows) stopped responding. After a (long) while I restarted everything but then during another try I got an information that firmware update failed.

I've tried running jlink.exe and use advice from here: devzone.nordicsemi.com/.../ but I can see a message that "Failed to activate bootloader (timeout)".

nRFgo Studio recognizes nRF51-DK and if I wire up external nRF51822 chip to it it recognizes it. The problem is I can neither program any device using on board J-Link nor update its firmware.

Is there any possibility to reflash the bootloader using another nRF51-DK or I would need stand alone J-Link to do so?

Hope we can figure something out to fix it, thanks!

[Stian Røed Hafskjold]

Are you able to enter bootloader mode on the atmel chip that contains the J-Link interface? Hold down the "IF BOOT/RESET" button on the DK while switching it on, and it should show up as an external disk named "BOOTLOADER". Try to flash the entire J-Link interface by dragging the "J-Link OB-SAM3U128-V2-NordicSemi 150311.bin" file over to the external disk. It can be downloaded here: www.nordicsemi.com/.../38671

[Crllo]

Hi Stian,

yes, theoretically I can enter the bootloader mode - the LED flashes, I copy the file to "BOOTLOADER" device and the LED blinks faster. After turning the power off and on again and running nRFgo Studio I still get the same message - about a need for firmware update. Then it fails again.

If you have any idea how to diagnose the problem I have 50 MHz oscilloscope and multimeter I can use.