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OK. I have an interesting one. I have a urmet plus tag (Mifare Classic 1K 7 Byte UID). I have made an identical clone of this tag using icopy XS and Proxmark3 RDV 4. I compared the original and clone, they are identical, however the reader does not even recognise the card when presented? What am I missing here? Any hints or ideas would be welcome.
[usb] pm3 --> hf search
[|] Searching for ISO14443-A tag...
[+] UID: 04 9B 5F 42 42 57 80
[+] ATQA: 00 44
[+] SAK: 08 [2]
[+] MANUFACTURER: NXP Semiconductors Germany
[+] Possible types:
[+] MIFARE Classic 1K CL2
[=] -------------------------- ATS --------------------------
[=] --> SAK incorrectly claims that card doesn't support RATS <--
[+] ATS: 0C 75 77 80 02 C1 05 21 30 00 77 C1 [ d3 00 ]
[=] 0c............... TL length is 12 bytes
[=] 75............ T0 TA1 is present, TB1 is present, TC1 is present, FSCI is 5 (FSC = 64)
[=] 77......... TA1 different divisors are supported, DR: [2, 4, 8], DS: [2, 4, 8]
[=] 80...... TB1 SFGI = 0 (SFGT = (not needed) 0/fc), FWI = 8 (FWT = 1048576/fc)
[=] 02... TC1 NAD is NOT supported, CID is supported
[=] -------------------- Historical bytes --------------------
[=] C1 05 21 30 00 77 C1
[+] C1..................... Mifare or (multiple) virtual cards of various type
[+] 05.................. length is 5 bytes
[+] 2x............... MIFARE Plus
[+] x1............... 1 kByte
[+] x0............ Generation 1
[+] x0......... Only VCSL supported