How to unlock the NTAG NT3H2211 with Arduino

[marvin_lochmann]

Hello everybody,

currently I'm using the NTAG NT3H2211.

Honestly, i was writing a lot of data on the chip without knowing where the data was saved. I assume i changed the capability container and/or some of the lock registers.

I am not really familiar with unlocking specific registers. Can you help me?

The first registry is filled with:

04 2F 25 E2

C5 4E 80 00

44 00 20 40

E7 78 FB 62

Config. Registry

01 02 F8 48

08 01 00 --

Session registry

01 00 F8 48

08 01 01 --

I hope this helps.

thanks alot

[marvin_lochmann]

Hello,

thanks for your reply.

here is the datasheet. https://www.nxp.com/docs/en/data-sheet/NT3H2111_2211.pdf 

As i wrote, the password protection is changed to

x 44 00 20 40

i am sure it should be but, as you wrote, its password protected.

44 00 00 00

It seems that i also changed the Capability Container (CC) to

E7 78 FB 62

which i am not able to change with my current programm.

any help is appreciated

[fernandohcoelho]

Hello,

First of all, try reading the tag with the NXP Tag Info App for Android. It will bring a lot of information about the tag.

Second, also in the app make a FULL SCAN. If the sector is marked the a '*' it is permanently locked and cannot be changed. Sectors marked with 'XX' are password protected and can only be unlock with the AUTH command.

Always watch out for the "Control Sectors" of tag (probably the 02h and 03h sectors). You can permanently damaged the tags if you mess around with them.

Datasheet is always helpful in this cases.