First of all you must have unlocked bootloader on your Xperia Phone. To do that please refer to the official guide from Sony on How to unlock bootloader on any Xperia Phone ? It is mandato
ry to do that.
ry to do that.
Sony Update Service (SUS) then you always flash the original firmware’s ftf file on your phone via Xperia Flash Tool.
Download flashtool-0.9.10.2beta6-windows.exe
Download the “ftf file” of your Xperia device which is must needed in any case.
Read more »
