Hello, i can't format my desfair ev1 card, after authentication in app 00 (root) i send format command and recive next answer: f2 01 after which I can not use the card. How right format the card? I trying send cmd.Format + MAC(4 byte) + CRC16, and recive error 0x7E.
I have the identical problem.
Cards are overseas sourced and using MF3ICD41 ( so they say, but as per NXPs Tag info app. ).
A few also came from a source at Amazon.com. Card are only good for CSN once this occurs.
Any native card command results in PCB 0xF2 followed by RC 0x01 ( 0xF2 0x01 )
Cards operate mostly okay other than this, as long as you don't run 0xFC of course.
btw: system is a TI micro driving a 663 frontend.