Ok so i really need for sumone to help me with this i have an iphone 3g 3.1.3 frimware ive jailbroken it and unlocked it was working fine but it was really slow so i upgraded it and downgraded to 3.1.3 by kicking it out of recovery mode and now the phone doesnt connect to wifi i used to be able to connect to my wifi in my room and now i have to be rite next to my router HOW DO I FIX THIS PLEASE HELP ME 