I have some tags which claim to be EM4205. Setting tag type to EM4X02 allows me to read the UID. But I cannot see any way to read or write other data blocks. Looking at the firmware source code, the case statement in read.c and write.c clearly does not cater for many tag types, only HITAG1, HITAG2, Q5, T55X7.
Any suggestions on a way forward? I personally won't have time to write the code for a very long while :-(