UID changeable mifare s50 card

1. It is used as a mifare card, it has backdoor to change the uid of the card.

you can use libnfc' command nfc-mfsetuid to change the uid of the card

2. details instruction on http://www.xfpga.com/html_products/sp-mf-1k-bd-27.html
3. contact email:  xfpga@hotmail.com