Bricked on-board debugger BMD-340 evaluation board (Rigado)

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I probably bricked my BMD340 evaluation board on-board debugger, which uses JLINK. I can only call the bootloader when pressing reset while power on. Is there a possibility to flash again the on-board debugger? I fear the firmware is not available.

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Yann On BEST ANSWER

Works with the same interface interface MCU firmware image as the regular NRF52840 DK. Download it and put it on the board in bootloader mode.