NTAG 424 - Unable to Read Proprietary File Data

[Chris_Smith]

Using TagXplorer v1.2, I am able to setup the PICC and MAC mirroring, which is working perfectly.  I'm now attempting to make duplicating the tags easier, by reading the NDEF and CC data to quickly write those values to a new tag.  However, the mirroring does not work, which I believe is due to the missing Proprietary File data.

When I attempt to read the Proprietary File data, I get the following error:
com.nxp.nfclib.exceptions.PICCException: Error : 91AE

Is there a trick to reading and writing this data?

Thanks!

[Kan_Li · Accepted solution]

Hi @Chris_Smith ,

At delivery, Proprietary-File has READ Access Condition = 82h, i.e. Limited READ access, granted
based on proprietary methods, after authentication with key 2h. Please kindly refer to https://www.nxp.com.cn/docs/en/data-sheet/NT4H2421Gx.pdf for details.

"91 AE" just means "Authentication status does not allow the requested command".

Hope that makes sense,

Have a great day,
Kan

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[Chris_Smith]

Thank you, Kan.  I was able to change the permissions and read/write the Proprietary File data successfully.

I was under the impression that copying this data would resolve my mirroring issue when copying the hex values to a new tag, but the issue remains.  Is it possible to copy the mirroring configuration from one tag to a new tag?

[Kan_Li]

Hi @Chris_Smith ,

No, I don't think it is possible, please refer to https://www.nxp.com.cn/docs/en/application-note/AN12196.pdf for the right Personalization process.

Have a great day,
Kan

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[Chris_Smith]

Thank you for your input.  I'll take a look.