UID Changeable 4K S70 1K S50 4 Byte 7 Byte Ultralight EV1 ACR122U Card

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SKU: SF6087
Including Tax: $1.36

UID Changeable MF Classic 1K or 4K (4 bytes or 7 bytes)

VERY IMPORTANT: UID / Block 0 can only be re-written using the ACR122U with the provided software.

  • Not with the Proxmark3 or other devices.
  • UID / Block 0 can be re-written multiple times only by using the ACR122U. Software download link is provided with the cards. 
  • Choose from the Classic 1K S50, 4K S70 or Ultralight EV1 card. Also choose from the common 4 byte UID card or the newer 7 byte UID card. 
  • You can choose to lock Block 0 with the ACR122U software which will permantly lock Block 0. 
  • Card may die if an invalid Block 0 is written 
  • Answers to chinese magic backdoor commands: NO.


  • Frequency: 13.56 MHz
  • Protocol: ISO14443A
  • Rewrite Times: 100,000 times
  • Read Distance: 0 ~ 10 cm(depends on the R/W device)
  • Material: PVC
  • Dimensions: 85 * 54 * 0.9 mm

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