So i fiddled around with my pn532 and MFRC522. In Swissgerman we say “lauerisiech” to people like me. Because I was a bit to fast and forgot to change the BCC of the new UID. I realised it just after the write was done. Well now my xM1 is bricked. I tried unbricking it with the MFRC522 but as i wrote here xm1 unlock block 0 the MFRC522 is not working for me.
I googled a bit and I came to the conclusion to buy a proxmark3. But I first wanted to know if I can unbrick the bricked Implant or if I need to get this one out and get a new one?
nfc-mfsetuid command from LibNFC might help you, easiest way is on linux to install but it can be done on other platforms. Still an PM3 EZ is the best.