WARNING !!! It will void your warranty and raise the bin counter . (No need to worry though because you can reset the bin counter so that your warranty comes back via triangle away)
Ans : CWM has many more functionality than stock recovery ! Rooting means to playing around with your device.If some thing goes wrong it you have to flash the whole firmware again instead,backup your ROM through CWM and if something goes wrong restore your backup AS SIMPLE AS THAT !
All you have to do is follow my instructions :
STEP 1 :
-Download and setup ADB drivers for your device
can be found here Drivers !
STEP 2 :
-Download the recovery from here ---> 4.1.2 4.2.2
-Download odin 3 from attachment below !
-Turn of your device and go to odin mode [ Vol down + power + home button (all at the same time) ] release it when you see GT-i9082 logo
-Press vol up to confirm
STEP 3 :
-Now that you are in odin mode connect your device via usb cable !
-Now open Odin3 3.04 that you have downloaded from the attachment !
-If there is a pop-up like Installing ADB drivers let it get finished it is usually updates !!!!
It should look like this
-Make sure the COM : xx (xx is usb port number it can be any number so dont worry about it,just verify COM is lit up)
-Select the recovery according to your android version(Link in STEP1) ! Now select PDA and browse to where you have .tar file and select it
it should look like this
STEP 4 :
HOW TO ROOT THE DEVICE :
-Download SuperSu (obviously the latest one) from here ------> Click here !
-Copy that to externel sdcard or internal
-Power off your device and press vol up + power + home button (all at once)
-Select install zip from sdcard --->choose zip from sdcard ---> scroll down and flash UPDATE-SuperSU-v1.xx.zip
Done ! And you are ready to go
pawitp for both the recoveries