How to root Samsung Galaxy S Duos 2 via pre-rooted firmware

PRE-ROOTED-LATEST FIRMWARE:

latest_pre_rooted_system.7z.001
latest_pre_rooted_system.7z.002
latest_pre_rooted_system.7z.003
latest_pre_rooted_system.7z.004
latest_pre_rooted_system.7z.005
latest_pre_rooted_system.7z.006

PROCEDURE:

1). INSTALL 7ZIP LATEST SOFTWARE ON TO YOUR PC.

2). DOWNLOAD THE ABOVE FILES AND PLACE THEM ALL IN ONE FOLDER ON YOUR PC.

3). RIGHT CLICK ON pre_rooted_GT-S7582.7z AND SELECT 7ZIP.

4). THEN SELECT OPTION "EXTRACT HERE" NOW YOU WILL GET THIS ONE FILE NAMED pre_rooted_GT-S7582.tar .
5). DOWNLOAD ODIN ANY VERSION AND OPEN THE ODIN,EXE.

6).THEN SELECT PDA, BROWSE FOR pre_rooted_GT-S7582.tar FILE AND SELECT IT.

ENTERING DOWNLOAD MODE:

1). SWITCH OFF YOUR MOBILE, AND PRESS VOLUME DOWN+HOME KEY+POWER KEY ALL AT ONCE AND WAIT FOR DOWNLOAD MODE TO COME.
2). PRESS VOLUME UP KEY TO CONTINUE INTO DOWNLOAD MODE.

FLASHING THE FIRMWARE FILE:

1). NOW CONNECT YOUR MOBILE TO PC VIA USB CABLE.

2). THEN PRESS START IN ODIN, THEN LET ODIN DO ITS JOB.

3). YOUR MOBILE WILL REBOOT AFTER FLASHING COMPLETED BY ODIN.

4). FINALLY CHECK FOR, SUPERUSER.APK, AND YOUR MOBILE IS ROOTED 

Note: The article has been copied from XDA Developers by Chirtagh