OS: Ubuntu 18.
Board: nrf52-DK, PCA10040 (1.2.4)
It worked well, I flashed as blink or BLE firmwares and may saw the results.
I re-flashed Bootloader from nrf52-DK (by press reboot button & drag&drop some firmware)
Currently, my PC can't recognize the board. Led1 and Led3 are in the high state.
Tried to find some bootloader firmware and flash - all unsuccessfully.
Question: how to recover the board bootloader?
