I can get in boot mode :
The fact that you can do that means your safe despite what these guys are saying.
All you need todo is turn your phone off, hold down the camera button and shove a usb in.
Wait and this will put your phone in the 3 coloured bootloader screen, next find an official update for your phone, from the carrier or samsung or something and run it.
The upgrade program will recognise your device as a an i600 because its in bootloader, follow the procedure and dont touch anything untill its finished the upgrade and your i600 will be good as new!
Seriously dont worry, just read up on rom upgrades, cid unlocking and read tons of forums about the upgrade and an upgrade procedure itself before you even touch an unnoficial installer lol.
Hope it all sorts out!