Saturday, 31 October 2015

How to Downgrade from B521 to B390 or B370 ??



Hello Everyone
I want to to install B512 that show message "Update Failed"
but Install B521
right now myphone has a lot of lag and not smooth and slowly run
i want to downgrade to B390 or B370 (Kitkat)
if possible please help me :confused::confused:
thanks
sorry , my english is very poor



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