[Q] unlock the bootloader without flashing rom
i have WT19A live with walkman, i wanted to update from GB2.3.4 to ICS 4.0.4,
1.i open "Update Service" it was ready for update,
2.before apply the update ,just in case if something goes wrong, i opened the bootloader, because my phone have carrier ROM,
if update will fail i can change rom,)
3.i return to "Sony Update Service" and now it saying ,can't update because "modification detected"
i know flashing any stock rom will fix this &also i can upgrade this way with flashtool, but the carrier ROM is better and built in with my primary language
and i dont have backup of the that rom, what can i do to fix it?
it is possible lock the bootloader again another way that i can using sony service update again?