What's the difference between uid and id?

CUID ID card (called GEN2 abroad) does not respond to backdoor instructions, which means it is not easy to be discovered by anti-cloning system. All blocks can be read and written repeatedly, and the card ID can be changed and modified repeatedly by using ordinary writing instructions.

UID card (called GEN 1 in foreign countries), responding to backdoor instructions means that it can be found by machines using backdoor instructions, and whether it is a cloned card is detected. All blocks can be read and written repeatedly, and the card ID can be modified and changed by backdoor instructions, and the ID can be modified repeatedly.

The UID card is an IC card and can modify any sector. As a daughter card for copying M 1, it is mainly used for copying IC cards and is fully compatible with MiCare1K cards.

CUID card is an erasable anti-shielding card, which can erase all sectors repeatedly. If the copy of the UID card is invalid, it can bypass the firewall.