Where is the unlock sector command?

antback · ‎2014-02-24

Posted on February 24, 2014 at 17:02

Hi all,

I can see in the documentation the command ''Lock Sector'' and used in the android demo application but I cannot figure how to unlock a sector.

Using the application, I have changed the first password and locked the first sector and now I cannot write it and unlockit.

Can Anybody help me?

Thanks a lot.

#lock-sector #m24lr #password

antback · ‎2014-02-25

Posted on February 25, 2014 at 09:54

Ok, I see how to unlock a sector, the problem is that the first password has been changed and I don't know its value. Anybody knows any way of resetting its value?

http://www.st.com/web/catalog/tools/FM116/SC1444/PF253360

is the device that I have.

Thanks a lot!

Anais GALLIGANI · ‎2014-03-05

Posted on March 05, 2014 at 09:48

Hello,

On delivery,

the three default password values are set to 0000 0000h and are activated.

When a sector is locked , you must present the correct password to unlock it , access is then define by SSS setting .

The I2C password is a Super user password and allow to overwrite the RF password and SSS which is not possible in RF for security purpose .

Have a nice day,

ST NFC/RFID Dynamic tad e2e support

dombar29 · ‎2014-11-24

Posted on November 24, 2014 at 14:10

Hello,

I have read in M24LR64E that RF password can not be read or write from I2C.

(Datasheet M24LR64E-R page 31/140 --> ''

The next three 32-bit blocks store the three RF passwords. These passwords are neither read- nor write- accessible in the I2C mode.

''

Could you confirm that it's possible to read/change/reset the RF password from I2C?

Regards,

Dom