Can sony ericsson z610i flash to w660i?
if it cant , can it be flashed to other ? i know k750i can be flash to w800i but can z610 be flash to something?



how do i make GDFS backup?
and where do the backup be replace when i have backuped it.

Yeah.
Use the MAIN, FS and CustPack of the W660(the same CID).

To make the backup with Setool2Lite.
Click in READ GDFS and then connect your phone with C press.
And wait!!

must i use custom?

will it brick my phone?

but What about i only flash with FS and main? do it work?

Dont.
You need CustPack.
Flash with all archieves!!

i got XS darwin 3,1 but i cant make GDFS backup.

Make with FAR MANAGER!!
See the tutorial and guides thread!