i did several times, but in vain. tried device reset too, but cudn't get default settings. Then i updated q tweak to latest 6.3 version and tried again, but same...
when i choose option 2 in Mod (X) I am getting this

cp: can't stat '/home/usr/MyDocs/.N9QTweakBack
up/usr/share/themes/base/meegotouch/libmms-messaging-plugin/style/*' : No such file or directory
killall: messaging-ui: no process killed