DON'T PANIC... listen to me !
1) X35 FLASHER & REPAIRER
2) FULL BACKUP VER. 05 ( REPAIR BIN )
3) FREIA
so...
- run X35 flasher, open ver. 05 repair BIN and click on REPAIR PHONE
- now the phone is net locked, open FREIA, UNLOCKING, UNLOCK NO DIRECT MAP IS SAVED ( enter your original IMEI ) and OK
- now u can upgrade to desidered version , the phone will remain unlocked.