Dude..... I also did experiments wid ma phn......... nd faced da same prblm at da beginning...... try odin 3.04... its da best..... nd download ur s2 stock rom through sammobile.....


1st make sure dat samsung usb drivers are installed in ur pc..... install samsung kies...... it will automatically install drivers to ur pc.....

Den boot into download mode.... connect usb..... open odin in pc.... unmark auto reboot option...wen it shows blue color box written id:com....... flash ur s2 stock rom..... and wait till it doesnt get completed....... it will take time...so be calm..

after the rom will flashed completely....it will show a message "pass"

disconnect ur usb..... remove da battery.... wait for. 10 sec.... and reboot....... let me know if this helps u out...

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Current Device-Galaxy Grand running GenNxt ROM