[Q] Change CSC XEF on GT-N7000

Hi,

I use a Galaxy Note GT-N7000 from 2011 until now. I never root, and not touch any other aspect of the device. I receive only the official firmware update and now have the ICS 4.0.4 as last version.

The info of the device is:
CSC: XEF
Baseband: N7000XXLRB
Build: IMM76D.XXLRI

My question is: if I change with *#272...... the XEF code to OXA, for example, this mean that after reboot I can get the OTA or KIES update to 4.1.2? I only like update my device to 4.1.2 without root or any other complicated procedure.

Thanks in advance! :)