Hi @warrenwillingham, sorry I didn’t get back to this thread… basically yeah, there are some PN532 boards from China that are basically knock offs and don’t work so well… they use crap parts and the tuning is bad and inconsistent, so some boards may work with the xNT, some may not. Our PN532 reader board is from a legit source and works consistently with the xNT and really well with the flexNT.
Also, the password… it is possible to set it to another value, but you cannot remove it. The factory default password is FF FF FF FF, so you could set it back to factory, but it is not possible to “remove” it… only set it back to factory default.