Boron is completely dead

[peekay123]

@vitaly_pochtar, you may want to take a look at these posts:

How to unbrick Xenon (return to factory default firmware)

@janek after some research and trying it myself, you can un-brick a Xenon, Argon and Boron using a NRF52 DK (or similar) A full explanation is coming but you can clone this repository. Then, you can follow the instructions at the end of the Readme. You need to download a bootloader binary from the release page on Github. You’ll also need the soft device. Good luck!