1- stay in GB ROm and download the Files that u must have !! chinese repack iCS, Abyss 4.1 kernel, Team Rocket ICS v1.4, Team Rocket iCS v 1.5 ( download all and put them to your device !!!)
2- upgrade to chinese ICS repack and install it with Mobile odin or odin pc
3- when u have upgraded to chinese repack ICS and upgrade is successfull then go to CWM recovery mode
4- FULL Wipe (data/factory, wipe cache, wipe dalvik cache)
5- Now flash Team Rocket ICS v 1.4
6- when upgraded stay in recovery and NOW do a FULL Wipe (data/factory, wipe cache, wipe dalvik caache)
7- again a full Wipe data/recovery this in case you to make sure !!
8- reboot the phone or restart the phone
9- when u r in team rocket iCS v1.4 see if u have root (use eSExplorer) , superuser app
+ setting up Google Account (eybee)
10- now all things in step 9 are in rocket Rom v 1.4 thats a successfull installation
11- now start in CWM Recovery mode
12- do wipe only cache and dalvik cache wipe !! No full wipe needed