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Original nrf51DK board have default com port. But after I use MCP windows,
it'll need flashing a image and short P0.30 GND, com port disappear.
Even after reflashing Jlink if bin file.
How to let it back?
most probably your device is in a bricked state. try to recover it using nrfjrpog using this command in cmd in windows.
nrfjprog --recover
