Revert back to proper kit [from 2.1]

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I simple way to unFinnish your phone settings and revert back to original kit
[without going back to 1.6]

0: Back up phone

1: Uninstall SE Companion
[I guess you might be able just to delete data in appdata folder, but uninstall is safer]
2: Reinstall SE Companion

3: Push old (1.6 version of your own kit worked for me, if you saved it that is) build.prop to system folder using "mount -o rw,remount /dev/block/mtdblock0 /system" command if necessary to get Write ability, see [ thread id t=740338 ] .
Otherwise just edit the build.prop to correct kit number (it should work)

4: In SE companion Click more in support zone and then click repair
5: SE companion should download the files necessary and then update your phone to the proper kit

6: Magic you are back to your own kit with proper keyboard settings and 2.1 (Ah, YuS - your kit needs to have the update of course)

So basically all you have to do is revert your /system/build.prop to it original version and restart, right?

Repair - YuS.
But, you have to uninstall and reinstall SE Companion.
Because, if not it has the other 2.1 settings already saved in a folder (I am not sure which one exactly).
Uninstalling and reinstalling it forces it to download the 2.1 ("repair") version that is specified in the pushed build.prop