UID Changeable M1 S50 Block 0 Writable CUID FUID GEN1 GEN2 Card

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1+ $1.95
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500+ $0.80
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SKU: SF6004

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UID Changeable cards are used to duplicate Mifare Classic 1K access cards.  Whilst generally it is best practice to use unique Mifare Classic 14443A cards for each user, there are some instances where you may wish to clone a card and have multiple cards with the same UID and data.  For example access control with few users with no user having the ability to add new cards into the system.  Or for access control that has a user limit which has been reached.  All three types of cards can be programmed with the Proxmark3, ACR122U or iCopy 3 devices.

IMPORTANT: There are three different types of cards that you can choose from:

Type 1: Normal GEN1 UID Changeable Cards:

  • All blocks (including Block 0) can be re-written multiple times 
  • Use ProxMark3 (Magic Chinese Guy function) or libnfc to change UID. 
  • Uses "backdoor" technique to change/rewrite UID. 
  • UID can be changed multiple times. 
  • Not suitable for MCT on Android (Mifare Classic Tool)
  • Answers to Chinese magic backdoor commands (GEN 1a): YES 

Type 2: Special GEN2 CUID Cards:

  • All blocks (including Block 0) can be re-written multiple times 
  • Not easily detectable by a system with "anti-clone" feature 
  • IMPORTANT: Card will die if an invalid Block 0 is written 
  • Use normal commands. eg. hf mf wrbl 0 B FFFFFFFFFFFF a473f601200804006263646566676869 
  • Answers to Chinese magic backdoor commands: NO 

Type 3: Special GEN2 FUID Write-Once Cards:

  • Block 0 can only be written once. 
  • Even greater protection from a system with "anti-clone" feature.
  • Also provides protection from accidental future modification of Block 0.
  • Use normal commands. eg. hf mf wrbl 0 B FFFFFFFFFFFF a473f601200804006263646566676869 
  • Answers to Chinese magic backdoor commands: NO

Generally, these cards are provided non-printed. Please contact us for more information if you would like these cards printed.

Card Size: CR80 (standard credit card size)
Card Width & Height: 85.60 x 53.98 mm
Card Thickness: 0.76 mm
Card Type: Access Card
Card Material: PVC
Card Frequency: 13.56Mhz
Card use: To clone Mifare Classic cards
Compatible Equipment: Proxmark3, Proxmark 3 Easy, ACR122U
Colour: White