This is the 4 Byte UID changeable Mifare Classic 4k size key fob (Gen1a).
The UID can be modified ONLY with an external device (PN532, PCR532, ACR122U, Proxmark3 RDV4, Proxmark3 X, and iCopy-XS).
The UID cannot be changed with NFC on Android or iOS devices.
Command to Change UID
By Proxmark3 RDV4, Proxmark3 X or iCopy-XS
hf mf csetuid --uid 11223344
By All-in-one PN532 or PCR532
The latest features of the MTools Lite app support modifying the UID of the Gen1a 4 Byte S70 4K card via Bluetooth PN532 Reader.
MTools Lite App can be downloaded from Play Store and App Store.
By ACR122U
Windows Program Download Link: PCSC_Mifare_Secure.





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