some instructions feel free to contact me i will try and help
I have a i9308 and any of the newer release of the "official firmware' messed up my start up and made it loop...
I installed this using Heimdall skipped the bootloader as it seems to fail in both odin and Heimdall on hardware build 6.00
I found the newest official rom bbs dot anzhi dot com/forum.php?mod=viewthread&tid=6344702 ... sorry not enough posts to send out side links ... i under stand.
everything else worked fine.... after this and i was able to back and do the usual install of CWM ..... which failed using Heimdall ... again on the bootloader .... so using Odin it worked ... i used virtual box and Windows 7 ... with the latest Samsung drivers ....i had to create a specific interface for the Samsung in virtual box so the i9308 would mount with out conflict in windows .... i was then able to install CF-Root-SGS3-v6.4 ...
Once rooted i started looking for a way to install google play and all the google services.
i installed this ROM anzhi_karben_samsung_i9308_V1.0 which had the google drivers i needed and was not full of to much other crap and worked well in english ... i found this here bbs dot anzhi dot com/forum.php?mod=viewthread&tid=6198323 i used my Wiebo account to do this and was then able to download.
I got the google pack ..... well one that worked and after i checked everything did not have any malicious scripts that i could find ... bbs dot anzhi dot com/forum.php?mod=viewthread&tid=5401203 ... the zip file was gapps-ics-20120429-signed-4.0.4
i hope this helps some people Heimdall took a little after i figured out how to do this.... it was easy ... i have wiped it out a few times i nthe last week and tried different ROMs from the various Chinese boards ...some made very odd requests for SU access here and there ...i generally removed them after trying to find the offending script .... as i said so far the ones i am using have been pretty safe with little to no issues. I did go in and remove a lot of the preloaded China Mobile wares ...so far the phone is great ... i do fid the wifi signal sucks....
My first android i rooted myself ...see what happens after a drunk night in a taxi in Beijing and you lose your iPhone.... having fun.