cant flash any firmware even stock firmware i9100g

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http://forum.xda-developers.com – I gt a i9100g and yesterday i updated my i9100g to ics with superatmos v1.2 but wifi problem so i have downgraded to 2.3.6 dzkl3 firmware. after i downgrade i would like to root but odin stuck at setup connection and wont proceed next step. so that i flash again dzkl3 firmware. after i flash again firmware icant root or flash stock firmware even i format cache or format data... odin stuck at setup connection. PLEASE HELP ME >< (HowTos)