nrf51 DK board not detected !

[Bhuvanchandra DV]

Hi

Recently we bought NRF51 DK board. Initially when i connect the nrf51 DK board to PC via USB it mounts JLINK driver and on IF/BOOT button it mounts BOOTLOADER drive. Updated the bootloader firmware 'ble_default_bootloader_app.hex' (initial FOTA image: developer.mbed.org/.../ to BOOTLOADER drive. After this i was not able to see the LD5 led blinking/on, and not able to detect the nrf51 DK board as USB device/MSD, tested with nrfGo studio and with JLink tools also. How to recover the bootloader and detect the nrf51 DK board?

[Susheel Nuguru]

I think you flashed the wrong bootloader, try to recover your device using

nrfjprog --recover option

or Run JLink Commander ( JLink.exe ) and in it's command window give following commands; si 1 r h w4 4001e504 2 w4 4001e50C 1 w4 4001e514 1 r That reset's whole flash

[Bhuvanchandra DV]

Hi Aryan, It took a while for us to get the J-Link EDU. Tried connecting the nRF51 DK board to external J-Link EDU via J3 on board, erased and flashed the firmware 'J-Link OB-SAM3U128-V2-NordicSemi_150311.bin'. Flashing process seems successful, but after resetting, still the nRF51 DK OB J-Link is not getting detected! Flashing procedure followed: http://pastebin.com/y8JQeQqC Can you check the above procedure and tell me if any thing went wrong! If possible can you provide the steps/references for re-flashing the firmware to un-brick the nRF51 DK OB J-Link using external J-Link EDU. Please let me know if you need any info from my side.

-- Bhuvan