N.B: Sammobile has published a corrupted zip file of latest firmware M250KKKJMG1. for that reason you will have to download M250KKKJMB1 to upgrade M250KKKJMG1
I am uploading the latest Stock firmware of SHW-M250K 4.1.2 to google drive, mediafire.
you will get links tomorrow . stay tuned
Google Drive: https:// drive. google. com /file/d/0B8Uc2onR8VpsU0xZeG9nZXdGMEU/edit?usp=sharing
If you are using roms of GT-I9100 (International), Then you must flash pit file with odin otherwise you will have boot loop.
Use the provided pit file for pit option and pda for tar.md5 option.