I tried the 530i firmware its better than the original k610i firmware,everything works except the radio and video call service,if ur mobile network doesnt have this service download it now and here is the link:
http://www.iprotebe.cz/?se_sekce=11501111
u will find the main & fs in this link,but dont forget to download the display driver to prevent the color invertings,unfortuenately i dont have it,sorry,but if anyone has it please give us the link