AW: [Q] Your device has been modified. Software updates are not available?
If you want to root your phone, use Framaroot recommended.
When you open the app, there is a list: Root with Superuser; SuperSU and Unroot.
Root with SuperSU is recommended.
If you have a I9300 take the SAM-Exploit, if I9305 the FRODO-Exploit.
If it don't work, try the other Exploit
It won't change your FlashCounter!
And when you want to unroot your phone you have to go in SuperSU, Settings, scroll down and click Full Unroot.
If your device status is Modified anymore, reflash StockROM and wipe your data!
Greeeetzzzz...
Sent from my GT-I9300 using xda app-developers app