No GDR3 thread yet? Successful update. Here are the details:
- ATIV S(unbranded, unlocked) from official Russian retailer.
- Updated from GDR2, which i flashed manually using tools and image from infamous GSMhosting thread(check GDR2 thread or google for details).
- I used AppStudio account(which is free) in conjunction with Microsoft profile associated with ATIV S.