veja o erro que da meu
usando SRSRoot
22:01:19 - Starting ADB Server..
22:01:25 - Manufacturer: samsung
22:01:25 - Model: GT-I9100
22:01:25 - Android Version: 4.0.4
22:01:25 - Build ID: GT-I9100-user 4.0.4 IMM76L eng.build.20130311.122614 release-keys
22:01:25 - Board ID: smdk4210
22:01:25 - Chipset Platform: exynos4
22:01:25 - Getting OffSets.. : Not found
22:01:26 - Query Server for Best Method.. Not Found (SmartRoot not possible yet)
----= Start Rooting Process.. Please Wait =----
22:01:28 [+] Testing exploit: root3 (Please wait some minutes)
22:01:28 [+] Executing root3 exploit Failed. (Root Error: 0)
22:01:28 [+] Installing exploit: root3c (Please wait...)
22:01:30 [+] Select 'FRODO' or 'ARAGORN' or 'LEGOLAS' on your device, then click OK
22:01:31 [+] Removing Exploit.. Please Wait..
22:01:36 [+] Analysing Results...
22:01:37 [+] Root Failed: Resume Exploit 4.
22:01:37 [+] Testing exploit: root4 (please wait..)
22:01:40 [+] Device Reboot #1 (Wait till it's started)
22:04:19 [+] Device Reboot #2 (Wait till it's started)
22:06:55 [+] Executing root4 exploit Failed. (Root Error: 0)
22:06:55 [+] Testing exploit: root4b (please wait..)
22:06:55 [+] Executing root4b exploit Failed. (mount not found)
22:06:55 [+] Testing exploit: root5 (please wait..)
22:06:55 [+] Unlock your device screen, it should bring up restore mode.
22:07:04 [+] Press RESTORE button on device NOW! then wait...
22:07:14 [+] Device Reboot #1 (Wait till it's started)
22:07:33 [+] Remounting /system Filesystem as R/W..
22:07:33 Error: Failed to remount filesystem