[Tutorial] How to revert back to stock rom and relock bootloader [mini/lww/pro/activ]

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http://forum.xda-developers.com – Bored with custom rom and want the taste of stable official rom. Follow this simple guide for reverting and getting BL locked again :- It is suggested to remove sim card and sd card as well as format sd card before installing ICS/GB Backup everything before proceeding if you wish. 1.Download official stock firmware for your device (gb/ics) from here. 2.Extract zip and place ftf file in the firmware folder of flashtool. You can download flashtool from here 3.Open flashtool as admin and click thunder button. Select flashmode and then select the ftf file. (HowTos)