i got a iphone and i upgraded to 2.0
then i tryed to downgrade i used alot of tutorials and 7.5 itune stuff when i restore i get error 1604 im lost so i was like no use ill restore back to 2.0 i put itunes 7.7 back and i restore and update i still get my 1604 this did hapen all the other time my iphone is in a 1604 and in a resotere mode and sometime is keeps turining off and on again wat i do

help helphelp plz any know how to fix the error or fix the iphone or like activate after u told me the fix plz help i need my phone and by the way i use mac and my iphone use to be jailbreaked and unlocked. help!!!