Recover DK-Interface IC Firmware

[Oliver]

Hi there,

I'm using a nRF52-DK for a while, but now I made a bad misstake: overwrote the interface firmware. I pressed accidentally the RESET button and flashed a wrong hex file. Now it does nothing, no blinking LED, no USB, no bootloader, just nothing.

To recover it, I soldered some wires to the SAM3u2c JTAG-Pins and connected them to a J-Link. Then I tried to flash as followed:

• 0x00000: 0243_sam3u2c_mkit_dk_dongle_nrf5x_0x5000.bin
• 0x80000: nrf5x_atsam3u2c_if_mbed_V0221_11012017.bin

But if I flash one section, the other will be overwritten, too. I tried Segger's Flash Lite and Embedded Studio and to verify it's Mem-tool.

Do you have any ideas how I may recover it, please?

How does it work with the J-Link FW (J-Link OB-SAM3U128-V2-NordicSemi 170213.bin)? Where should it be flashed to?

Thank you very much! Oliver

[kmorris]

Hi Oliver -

I've totally done that too. If you turn off the little power switch on the board and hold the reset button down while turning it back on, does it register now on the USB as BOOTLOADER?

If so, you can use the USB interface to re-flash the Nordic Bootloader on, which you can get at the links mentioned in this question. Just drag and drop the J-Link OB-SAMxxxxx.bin into the BOOTLOADER folder.

If not, hopefully a Nordic employee can pop on here and help you recover it.

[Oliver]

Hey,

unfortunately nothing happens during the power cycling with pressed reset button..,

[Stian Røed Hafskjold]

Maybe you've somehow managed to overwrite the bootloader. The source code is found here: github.com/.../CMSIS-DAP. Here you have a precompiled hex file: bootloader.hex

Flash the bootloader.hex using the SAM3U2C debug pins. Then power cycle the kit while holding down the reset button. It should now boot up in bootloader mode. (LED flashing, and BOOTLOADER drive shows up on computer). Then you can drag the J-Link FW (J-Link OB-SAM3U128-V2-NordicSemi 170213.bin) over to the BOOTLOADER drive to flash the new FW. Finally, power cycle the kit.

[Oliver]

Thank you very much - it worked!

[abhitaori]

Hello Oliver,

I am facing a similar problem. Can you help me recover my board? Can you tell me how to do this?

Which are the SAM3U2C pins on the DK board? Using which software do I flash the bootloader.hex file?