UID in not changing in the RFID

Projects Programming
1

I have used UID changer code from MFRC522 library to change UID for a card. i am getting the following errors when i trying the code.

"Card did not respond to 0x40 after HALT command. Are you sure it is a UID changeable one?
Error name: Timeout in communication.
Activating the UID backdoor failed. "

what would be the problem?

2

Please be careful where you post and pick the right category

I moved your post

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The U in UID is for unique. Generally it’s non modifiable (read only). Some cards do not have the read only flag and allow for modifications. It’s possible you don’t have such a card.