Unable to write a new password in ST25TV02KC

Santhosh22 · ‎2025-05-12

Hello all,

I am trying to write a new password in untraceable mode (tried in all modes) of my ST25TV02KC tag. I have downloaded the x-cube-nfc5 file and using the tagdetect example for STM32L476 board. After running the below code, the newly written password is not getting the accepted. Even the old password is also not working. Am I doing the process in the intended way?

Reader : ST25R3911B-DISCO MB1325-C

Brian TIDAL · ‎2025-05-13

Hi,

make sure to use the encrypted value of the new password as described in the section 6.4.18 of the ST25TV02KC datasheet:

See ST25TAGS_TVC_OpenSecuritySession for password encryption example code.

Also, I would also recommend to check the return code of the various API.

Rgds

BT

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

View solution in original post

Brian TIDAL · ‎2025-05-13

Hi,

make sure to use the encrypted value of the new password as described in the section 6.4.18 of the ST25TV02KC datasheet:

See ST25TAGS_TVC_OpenSecuritySession for password encryption example code.

Also, I would also recommend to check the return code of the various API.

Rgds

BT

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.