K750i as i remember is DB2010 and W900i is DB2000. So...it's not possible. Plus...if you look carefully at 1:55, you will see the W800i image => it's K750i with W800i R1L002 firmware (the onlyone from W800i that supports flash menus!).
Oh...btw: the screen resolution is not a problem 'cause display driver can be changed.

I can put K850 firmware on V630 :)). How? By changing the phone model in customize.xml.