my iphone 4 with TURBO SIM .i update it to IOS 5 and now i cant continue restoring my iphone !! any1 help plz !!

hello
im using unlock iphone with turbo sim card. i update my iphone to the new version IOS 5 and some bug were found. so, i restore my iphone to standard iphone. but, my iphone can not connect to itunes anymore, it said that the SIMcard inserted does not appear to be supported. so. i can't continue restoring my iphone. what do i need to do??? can anyone help me....