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Dual Format Frequency T5577 & UID CUID Block 0 Changeable Key Tag Fob

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SKU: SF6065

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50+ $2.95
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Dual Format T5577 & UID CUID

IMPORTANT: There are two different types of dual format fobs that you can choose from:

Type 1: T5577 & UID GEN1 Blue Fob:

  • Dual Format: Two Chips & Antennas inside each fob.
  • 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: T5577 & CUID GEN2 Yellow Fob:

  • Dual Format: Two Chips & Antennas inside each fob.
  • All blocks (including Block 0) can be re-written multiple times 
  • Not easily detectable by a system with "anti-clone" feature 
  • IMPORTANT: Fob 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 

Please note:

Weak and poorly constructed antennas can cause the card to permanently lock. Please make sure antenna is well tested and all surrounding EMI sources are turned off. If you are using a cellphone NFC chip please make sure that your cellular, WiFi & Bluetooth functions are all turned off before communicating with card. The card is tested and pre-programmed with a custom UID. If this card cannot revert back to the pre-programmed UID it is considered locked and not returnable. We do not provide technical support for this product.

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