Does that mean I have to go the long hard way with a bluepill as programmer and openocd ? Anyone has other ideas to unlock and erase the device ?
Select in to Tools menu "None" Softdevice and then "Burn Bootloader". This raises an error but the device is erased completely.
I am having the same issue trying to write on a E73 module with read/write protections. I don't have a JLink, but a ST Link-V2 and OpenOCD.
Do you know how to remove the protections on the E73 with such tools? Thanks.