NEED HELP ..2.0.1 upgrade to 2.2.0

Hi, everyone
I'm new to iPhone, tired to jailbreak my new 3G, v2.0.1 ,firstly and done successfully having current version 2.0.1 with modem firmware 1.48.02, since there is no network now.. now if i am trying to restore ipsw 2.2.0 (5G77) when i connect to itune "I error message: The iPhone "iPhone" could not be restored incompatable version . now anyone can help me to understand how to get it upgrade 2.0.1 to 2.2.0(5G77)ipsw, i am sure there must be some solution to work through.
Please help
Thanks in advance

Hi 2.0.1 to 2.2 should be pretty simple

Download the 3G version "iPhone1,2_2.2_5G77_Restore.ipsw" firmware from HERE

Put the phone into DFU mode & use shift/restore option to select the download ipsw in itunes etc.