nrf52840 dk not working properly

[taoyinzhou]

Dear Sir.

    I was testing dfu mode with an nrf52840 dk and held down the IF BOOT/RESET button, then powered up and waited a few seconds before it went into bootloader mode and could not recover!

    

    Please Advise.

[Simonr]

Hi

Please try reinstalling the Interface MCU firmware. It can be downloaded here, and you can see how to reinstall/update it properly on this page in the Infocenter.

Best regards,

Simon