I'm sorry if I'm posting this at the wrong place, but I'm kinda screwed =/

I just debranded my W910, but it was in english, which is not my preference language.
So I tried 'branding' my cellphone, forcing SEUS to upload the firmware to the original one. But when I tried to do that, it says it's already updated, but when I turn on the cellphone it shows a "configuration error" . What should I do?