I had a problem where the mobile screen went white for two K610i (within a month of each other). The phones because totally unuseable. I sent the first to the Sony Ericsson authorised repair company: Kuehne + Nagel and never saw it again! (The UK phone number to find the repair company was 08705 237237)
The second I tried searching the net. The following suggested changing the firmware:
http://www.3g.co.uk/3GForum/archive/index.php/t-51830.html
Thinking I had nothing to lose, I tried it and hey presto! back and running. I needed to google/research with firmware I wanted, but this time I got the set of languages I selected! It only cost 7 Euro! (I just used the data cable that came with the phone.)
The site used to reset the firmware was:
http://www.wotanserver.com/en/
but there may be others out there.
NOTE:
***FLASHING YOUR PHONE IS DONE AT YOUR OWN RISK***
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