Hello Neo, Boris,
yes, that`s correct - we are neighbors! I am from Bulgaria, bought the phone 2nd hand, but it was bought from a tech shop, no contract, should be unlocked. This means CSC for me is: Bulgaria: ---> BGL, CMF, GBL, MTE, MTL, OMX, OXX*, PLX, VVT
Thing is - I am not able to change it
So I am stuck (yet) on the Windows 8, and dont have 8.1.
Guys, is there an app for flashing that can change CSC? Guess I have to go the hard way.
Update: Checked on the bulgarian forum, seems some other guys have the same issue. So this is what I am going to do (the hard way = no sleep for me today).
Download GDR1 - GT-I8750 XXALL3_R_signed.wp8 and CSC for GDR1 -> GT-I8750_OXAALL3_R_SIGNED.csc with ATO included. All this loaded in WP8 SMD binary USB Downloader 3.33.1.
When flashing both GDR1 + CSC the phone will download all the WP8 updates + the firmware to the GDR3 version. Another restart -> some more updates and I should have a shiny new WP8.1 + new sammy firmware (no camera **** ups) with the cyan theme.
Cross your fingers