---------------------------------------------------------------
              Easy rooting toolkit (v3.0)
                  created by DooMLoRD
        using exploit zergRush (Revolutionary Team)
  Credits go to all those involved in making this possible!
---------------------------------------------------------------
[*] This script will:
    (1) root ur device using latest zergRush exploit (16 Nov)
    (2) install Busybox (1.18.4)
    (3) install SU files (binary: 3.0.3 and apk: 3.0.6)
[*] Before u begin:
    (1) make sure u have installed adb drivers for ur device
    (2) enable "USB DEBUGGING"
          from (Menu\Settings\Applications\Development)
    (3) enable "UNKNOWN SOURCES"
          from (Menu\Settings\Applications)
    (4) [OPTIONAL] increase screen timeout to 10 minutes
    (5) connect USB cable to PHONE and then connect to PC
    (6) skip "PC Companion Software" prompt on device
---------------------------------------------------------------
CONFIRM ALL THE ABOVE THEN
Press any key to continue . . .
--- STARTING ----
--- WAITING FOR DEVICE
--- cleaning
--- pushing zergRush"
682 KB/s (23060 bytes in 0.033s)
--- correcting permissions
--- executing zergRush

[**] Zerg rush - Android 2.2/2.3 local root
[**] © 2011 Revolutionary. All rights reserved.

[**] Parts of code from Gingerbreak, © 2010-2011 The Android Exploid Crew.

[+] Found a GingerBread ! 0x00000118
[+] Found a Samsung, running Samsung mode
[*] Scooting ...
[*] Sleeping a bit (~40s)...
[*] Waking !
[*] Sending 149 zerglings ...
[*] Sleeping a bit (~40s)...
[*] Waking !
[*] Sending 189 zerglings ...
[-] Hellions with BLUE flames !
--- WAITING FOR DEVICE TO RECONNECT
if it gets stuck over here for a long time then try:
  disconnect usb cable and reconnect it
  toggle "USB DEBUGGING" (first disable it then enable it)
--- DEVICE FOUND
Press any key to continue . . .
--- pushing busybox
1050 KB/s (1075144 bytes in 0.999s)
--- correcting permissions
--- remounting /system
mount: permission denied (are you root?)
--- copying busybox to /system/xbin/
/system/xbin/busybox: cannot open for write: Read-only file system
--- correcting ownership
Unable to chmod /system/xbin/busybox: No such file or directory
--- correcting permissions
Unable to chmod /system/xbin/busybox: No such file or directory
--- installing busybox
/system/xbin/busybox: not found
--- pushing SU binary
failed to copy 'files\su' to '/system/bin/su': Read-only file system
--- correcting ownership
Unable to chmod /system/bin/su: No such file or directory
--- correcting permissions
Unable to chmod /system/bin/su: No such file or directory
--- correcting symlinks
rm failed for /system/xbin/su, Read-only file system
link failed Read-only file system
--- pushing Superuser app
failed to copy 'files\Superuser.apk' to '/system/app/./Superuser.apk': Read-onl
file system
--- collecting crashlog
28 KB/s (1587 bytes in 0.055s)
--- cleaning
--- rebooting
ALL DONE!!!
Press any key to continue . . .

my guess is that u are on newer firmware, u should be on KJ2  or lower to use doomlord method.check my guide in signature
check my guide in signature