P.S.: I must say though that a discussion in the following thread makes me a bit worried about the operation - while I don't intend to revert by the serial port, still the version is not really supposed to work on my PW2:
https://www.mobileread.com/forums/sh....php?p=3181304
So I would really like to hear from somebody who tried and succeeded - if not getting the KUAL working, then at least not bricking the device.