https://community.nxp.com/t5/NFC/DUOX-PKOC/m-p/2353322#M14182 <P>Good afternoon,</P><P>I am trying to get a DUOX card to support the PKOC credential format.&nbsp; Is there any doucumentation available for this?&nbsp; I have the NFC Document from PKOC but it only shows the APDU structure to get the credential.&nbsp; I cannot find any documentation for how the actual chip has to be programmed.&nbsp; I have tried many steps and they all have failed.&nbsp; The one that I am trying now uses the AppMasterTempKey in the application so the application can be a true ECC only application.&nbsp; I was able to create the tempkey but the documentation is kind of confusing on how to disable it.</P><P>Under Section&nbsp;7.8.5.2.2 AppMasterTmpKey of the documentation the following is what is confusing.&nbsp; Under section KeyChange it states in the first line it states that the temp key is not changeable with ChangeKey or ChangeKeyEV2.&nbsp; So my question is how do I disable this TempKey so that it is a true ECC Application?</P><P>I have tried changing the key to disable it as the docuentation states but I keep getting a 9D error.&nbsp; Any help would be greatly appreciated.</P><P>Steve</P> Sat, 18 Apr 2026 17:57:12 GMT ingalmeyer 2026-04-18T17:57:12Z https://community.nxp.com/t5/NFC/DUOX-PKOC/m-p/2353322#M14182 <P>Good afternoon,</P><P>I am trying to get a DUOX card to support the PKOC credential format.&nbsp; Is there any doucumentation available for this?&nbsp; I have the NFC Document from PKOC but it only shows the APDU structure to get the credential.&nbsp; I cannot find any documentation for how the actual chip has to be programmed.&nbsp; I have tried many steps and they all have failed.&nbsp; The one that I am trying now uses the AppMasterTempKey in the application so the application can be a true ECC only application.&nbsp; I was able to create the tempkey but the documentation is kind of confusing on how to disable it.</P><P>Under Section&nbsp;7.8.5.2.2 AppMasterTmpKey of the documentation the following is what is confusing.&nbsp; Under section KeyChange it states in the first line it states that the temp key is not changeable with ChangeKey or ChangeKeyEV2.&nbsp; So my question is how do I disable this TempKey so that it is a true ECC Application?</P><P>I have tried changing the key to disable it as the docuentation states but I keep getting a 9D error.&nbsp; Any help would be greatly appreciated.</P><P>Steve</P> Sat, 18 Apr 2026 17:57:12 GMT https://community.nxp.com/t5/NFC/DUOX-PKOC/m-p/2353322#M14182 ingalmeyer 2026-04-18T17:57:12Z https://community.nxp.com/t5/NFC/DUOX-PKOC/m-p/2366739#M14220 <P>Have you tried the NXP RFIDDiscover software?</P> Mon, 18 May 2026 07:59:25 GMT https://community.nxp.com/t5/NFC/DUOX-PKOC/m-p/2366739#M14220 vincentthivent 2026-05-18T07:59:25Z