just flash it with the w800i firmware....r1bc002 work for cid 36 and cid 49.
all free use search,,,
k750i + w800i are the exactly the same mainboards(pcb)inside,same screens,flexs,only the the outer casing is different,,,but it dont av to b changed,unless u want the w800i casing.
plus the software/firmware in the phone is different,,,at mo u av k750i firmware in ur phone,,,just flash it with w800i firmware,it will become a w800i inside a k750i casing
you only need the usb cable.