UID-changeable Gen1a Magic RFID/NFC Card for Proxmark3, Flipper, access control, pentesting, etc.
Operates on 13.56 MHz and emulates a classic 1K, 4-byte-UID card popularly associated with a litigious manufacturer that likes to file complaints to eBay for naming their brand. This chip supports the "Gen1a" Chinese Magic commands, to allow access to block 0 to rewrite the UID and other manufacturer specific data there. This is a true CUID device, the UID can be changed repeatedly.
!! NOTE !! This CANNOT be UID changed using the popular MCT Android App. You need to use a Proxmark3 or similar specialized tool. You can write the user-accessible blocks with MCT or other apps, but cannot change block 0.
SAK/ATQA behavior: Card uses SAK 08 or 88 in the wakeup sequence, depending on the value in block 0. If the high bit there is set, SAK is 88, else 08. ATQA value from Block 0 is used as-is.
Message me if you want a specific UID written before shipment, otherwise you will get a random factory assigned one. I am generally not going to accommodate more involved custom writing requests, but you can do that yourself with common tools.