There are 3 types of UID Changeable S50 China Mifare Key Fob, CUID Key Fob, UID Key Fob, UFUID Key Fob. The main difference is the method of changing UID and backdoor commands support.
|Chip||Genuine Mifare 1K|
|Size||85.5 x 54 x 0.8mm|
|Operating temperature||-20 ~65 ℃|
|Writing Cycle||≥100,000 times|
Ordinary card VS Chinese magic card
How to clone card to CUID card on Android?
The block 0 of the CUID card is changeable, so you just need to write block 0 or full dump to the CUID card with the NFC device.
If the BCC byte or SAK byte is invalid, MTools will not write block 0 to prevent damaging the card.