i have recently purchased a Galaxy S dous S7562.....
but did not found a good & working method for rooting & unrooting this Phone Model.
so i tried methods like this --> method1 & method2 ,etc....
But the one which is easiest & secure is using a software called :-> UnlockRoot Pro
It is One Click Tool which can Root / Unroot our device [tested by me] :--> download from here
1. UnlockRoot Pro/free
2. Samsung USB Drivers
3. USB cable
4. Ofcourse Galaxy S Dous Phone
note :-> click on above requirements to download them..
Rooting Tutorial :-->
1. Install usb drivers on pc....
2. reboot ur pc
3. download the unlockroot free tool & extract on desktop or anywhere.
4. On ur phone >> goto Settings>Development> tick the option USB Debugging
5. Now Attach ur Phone with PC using Original USB cable.
6. open the "unlockroot.exe" extracted on desktop
7. u will see a dialog box that "do you want to add a battery saver app on ur phone"
8. u can click on yes or no according to ur need.
9. then u will be asked to "rooted successfully & reboot ur device"
10. click on "yes" & ur device will be automatically rebooted & u will see a new app [ supersu in ur AppDrawer ]
11. Ur phone is rooted now...
UnRooting Tutorial :-->
1. same as above .......just choose on "unroot" option @ 6th step
2. follow onscreen instruction
I think this is the easiest method & secure method of rooting ur device