I'm using 6.2.A.1.100 which is Android Version 4.1.2 from http://www.xperiafirmware.com/8-firm...-xperia-p-lt22
I don't know it's region.
Unlike samsung, region does not matter for xperia. trust me. The only things that matter are build number and android version when you choose the right firmware for your Xpeira
To unroot, use this software. It's pretty easy as it's one click.
The software is in Chinese. Check this image to see which button to be clicked.
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