I understand the K750i can be flashed to the W800... Ive got a program called TOTAL Multiserver, it has a tool that can flash upto W800 but I need to know what firmware to use, can anyone help?

Actually I dont think this program does it, but what can do it ?

I did this a while back with my K750i.  I just found the latest W800 firmware somewhere and flashed it.  Bingo.