Android Version?
Try to Flash a Downloaded Firmware manualy with CMD or via Odin.
Check" xda-developers" to download one for our Device...
That will works 100% on Android
v. 4.1 ; 4.2 ; 4.3.1
!!!★★☆→ make sure that you use the right ROM for your Device! !!!★☆★☆
★☆★ and !!!DON'T!!! downgrade directly from Android 4.3.1 to 4.2
use 4.1 to downgrade ... on 4.2 your IMEI will maybe change and after that your Sim-CARD is notlonger supported ( no mobile network , no phone)...