1. Downgrade system by odin with pit file to 4.0.4
link.
https://docs.google.com/file/d/0B5Au...em8/edit?pli=1
2. write I9300_Repair_efs.tar by odin
link
Dev-Host - I9300_Repair_efs.tar.md5 - The Ultimate Free File Hosting / File Sharing Service
3. your imei is now 0004 etc
4. open z3x and choise i9300
5. enable usb debug mode
6. type *#7284# and choise UART --> MODEM save and restart
7. choice repair bottom
8. after repair imei u must instal Cwm recovery by odin link.
Dev-Host - recovery-cwmtouch-6.0.3.2-GTI9300.tar - The Ultimate Free File Hosting / File Sharing Service
9. now download ariza path link.
Dev-Host - ariza_JBv02.zip - The Ultimate Free File Hosting / File Sharing Service
10. go to recovery mode volume up+home+power
11. choise instal from external sd an instal ariza path.