how to go back GB in CM9 nightly ??

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http://forum.xda-developers.com – Hi can u help me how to go back GB stock because because i have some issue of my phone .. so i can claim my warranty back IM running now CM9 nightly the latest version i want to go back GB stock for my warranty pls correct me 1. download a Stock GB ... < where can i download stock gb not rooted pls someone link me pls thx u> 2. flash it using PC odin....< is it safe to flash it in odin what step> OR i should put the file in PDA and flash it>? is it safe? 3.do a data/factory reset and dalvik / cachi wape< is this recomended?>?? or i will be got brick because i wape (HowTos)