13.56MHz RFID Key Rewritable CUID Changeable UID MIFARE for Access Control
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FAQ
Q: What is the difference between CUID and regular UID (Magic Gen1)?
A: CUID is an upgraded version. Unlike Gen1 UID cards, CUID can rewrite Block 0 (Sector 0) multiple times without being easily detected by anti-clone systems (firewalls). It has a higher success rate for public transport or elevators that have anti-copy mechanisms .
Q: How many times can I rewrite this key fob?
A: The writing/rewriting cycles are typically rated for more than 100,000 times, and the data retention is usually over 10 years under normal environmental conditions .
Q: Do I need special hardware to write this key fob?
A: Yes, you need a 13.56MHz RFID reader/writer that supports UID/CUID writing (e.g., Proxmark3, ACR122U, or specific PN532 based devices). Standard commercial readers cannot write to the UID area .
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