Originally Posted by sapiora
@Tkkg1994, I want to update your information, Sir. In your first post where CSC codes are you wrote this "GBL, Bulgaria unbranded". This is Bulgaria's Telenor operator. The unbranded CSC for Bulgaria is BGL. Which one do you have in your CSC codes?
P.S. Do I have to root my phone to use the procedure from the first post?
Yes I'm aware of that GBL, it's not up to date in the list but in the aroma csc it is
For sure you need to have TWRP installed and working, without it you won't be able to install it