• I was not successful with the script, it could not remove the protection on my E-Byte board.
    Maybe you need two scripts, first this one:

    nrf52.dap apreg 1 0x0c 0x00000000
    nrf52.dap apreg 1 0x04 0x01

    I finally had success with 'nrfjprog -f NRF52 --recover', this cleared the board even with an upgraded ST-Link interface (Segger upgrade). But nrfjprog and the upgraded cable could not program any bootloader. So thank you for this tutorial which made my day happy in the end :-)


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