w660-cannot start up..

[ya_sin90]

hey..
i've problem with my friend's w660 after i flashed it using phone xs++...
when i try to start it up, it says 'INSERT CORRECT SIM CARD'...
i've tried using all my friends' sim card, it shows the same...
then i know that's nothing problem with the sim card...
anybody knows what's the problem?:(

[riders4sia]

well, your friend phone is not a retail phone, it was a branded phone which was patch unlock. when you flash again main, the patch unlock is gone and you need to patch unlock it again. Probably the phone has network lock.
Read here : Remove SIM-lock patch generator - Top Sony Forums
and Tutorial here : Flash your phone and How to apply or remove patch using SETool 2 Lite - Top Sony Forums