Flash K750c (chinese) to W800 (also chinese)

[hyperion17]

my god, so easy?
i guess i should follow this, or there's any more fit guide?
but my computer (with avast antivirus) says XS++ (in that rar file) is a trojan....

Don't worry, it's not a trojan; just disable temporarily Avast and download again.
You should read part 2) Backing up GDFS and part 3) Flashing the firmware of this tutorial:
http://www.topsony.com/forum/phone-x...html#post60438.

@liudreak, you should do also step 4 of the tutorial:
4) you will then need to delete the lng.lst and lng.dat files that are also in the tpa/preset/system/language directory. (the phone should rewrite these with the new languages when you restart it)