Most 2.3.3 devices can only be cracked with Gingerbreak. I dont have a 2.3.3 device to test with so its a bit difficult to try to implement. Ill try to narrow down whats going on, but its difficult since I dont have a device to really test with. For now, it seems to not be working.
Also, devices running 2.3.4 need a special root. Many (but not all) Galaxy SII are supported by installing a patched kernel. Ill try to add a flag warning.
Oh, and yes, when Odin is working, DONT TOUCH ANYTHING! 🙂