3 ms·
Maybe some kind of custom NFC command that writes the UID into the EEPROM and sets a flag that it's now read only?
by grishka 2y ago
Maybe some kind of custom NFC command that writes the UID into the EEPROM and sets a flag that it's now read only?
- account42 2y agoIt's probably done through normal write commands if there is any explicit lock bit at all (it could doesn't just check if any of the UID bits are already non-zero and then reject the write). You can actually make other parts of the memory read-only too by setting bits at a specified address [0] (which then cannot be unset again). [0] https://www.nxp.com/docs/en/data-sheet/MF0ICU1.pdf#G4008599 https://www.nxp.com/docs/en/data-sheet/MF0ICU1.pdf#G4008599