Chrysalis Freezes on Factory Reset

Hiho, I have an Atreus Keyboard, after some accidental misconfiguration, tried a factory reset with chrysalis to start from scratch. Firmware flashing basically works, Chrysalis continuously freezes in the last step, so I end up after the flashing with my misconfigured settings againg. I this a known issue or does anyone have an Idea how to fix this? Regards, Martina