If you have backed up your TA partition during the bootloader unlock process, the restore the TA partition and then flash the STOCK ftf. This way you will have a locked bootloader and STOCK INDIAN ftf. But if you have not backed up the TA partition, You can still lock the bootloader as reported by many users. But you will not have the DRM keys. So i doubt if the STOCK official updates would work.
Hope i have helped you. Hit the thanks button if i have helped you!
Device Xperia L, UB,rooted,STOCK 4.2.2 (1.14) <Custom Modded! >
Any man that doesn't learn to laugh at rejection is worthless as a man.
NVIDIA tegra note 7 <Custom Modded LB/Unrooted>
Device history - X8,XU,XL,TN7