Unable to remove write protection on NTAG213 after enabling password protection (AUTH0/ACCESS) Hello NXP Team, I am working with NTAG213 tags using the PN7160 NFC controller and the NXP Linux nfcDemoApp. What I have done successfully: I modified the nfcDemoApp (main.c) to enable write-only password protection on NTAG213 by configuring: PWD PACK AUTH0 ACCESS (PROT = 0) The write protection works correctly: Mobile NFC apps cannot write anymore Writing is possible only after sending PWD_AUTH from my application Reset AUTH0 to 0xFF Clear ACCESS Re-write configuration pages I also enabled write protection on another NTAG213 using NXP NFC TagInfo / NFC Tools app, and that also worked as expected. Problem I am facing: Now I am unable to remove the write protection in both cases: Using my own code (nfcDemoApp) Using NXP NFC Tools / TagWriter mobile apps Even after authenticating with the correct password (PWD_AUTH), attempts to: are failing . My understanding: From the NTAG213 datasheet, I understand: PWD_AUTH should allow writing to protected pages during the RF session After authentication, it should be possible to modify AUTH0 and ACCESS NTAG213 does not have permanent lock bits for password protection (unlike lock bytes) However, in practice, I am unable to revert the tag back to an unprotected state. Questions: Is it officially supported to remove or disable password-based write protection on NTAG213 after it has been enabled? Are AUTH0 and ACCESS pages writable after successful PWD_AUTH, or are they permanently protected once set? Is there a recommended sequence to restore NTAG213 to a writable (unprotected) state? Can NXP NFC Tools / TagWriter remove password protection on NTAG213, or is custom raw command handling required? Is full reset (RF session reset / power cycle) required after authentication to modify configuration pages? Any guidance or clarification from the NXP team would be very helpful. Thank you for your support. Best regards, Niranjan Re: Unable to remove write protection on NTAG213 after enabling password protection (AUTH0/ACCESS) I use the RFIDDiscover. It is able to change the settings in configuration page to remove the protection.
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