Hi there, My nrf52840 DK seems dead. I want to recover it. What I did: Put the nrf52840 DK into Bootloader mode by pressing the "IF BOOT/RESET" button while powering up Drag a hex file (the preflash example from SDK) onto the icon shows BOOTLOADER [I realized that I made mistake here] Then I can't put the board into Bootloader mode anymore. The LED5 no longer blink. I found this issue: https://devzone.nordicsemi.com/f/nordic-q-a/23125/recover-dk-interface-ic-firmware That looks very similar to my case. The answer there mentioned: "Flash the bootloader.hex using the SAM3U2C debug pins." I couldn't find a detailed instruction on how to do that. Could someone guide me? What hardware/software do I need? Thanks in advance, lwshang

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How to recover the overwriten bootloader?

lwshang over 4 years ago

Hi there,

My nrf52840 DK seems dead. I want to recover it.

What I did:

Put the nrf52840 DK into Bootloader mode by pressing the "IF BOOT/RESET" button while powering up
Drag a hex file (the preflash example from SDK) onto the icon shows BOOTLOADER [I realized that I made mistake here]
Then I can't put the board into Bootloader mode anymore. The LED5 no longer blink.

That looks very similar to my case. The answer there mentioned: "Flash the bootloader.hex using the SAM3U2C debug pins."

I couldn't find a detailed instruction on how to do that. Could someone guide me? What hardware/software do I need?

Thanks in advance,

lwshang