Received a jailbroken 3g iphone with 3.0.1 firmware.How can I update to firmware 3.1.2 or 3.1.3?
Modem is 04.26.08
I still have one computer with itunes 9.0
After downloading the desired firmware below, you can shift-click (PC) or option-click (Mac) the Restore or Update buttons in iTunes. A file dialog will open and let you choose the downloaded ipsw-file.
Note: Your browser may change the ipsw-file into a zip-file. In that case, just rename it to end in .ipsw and iTunes will accept it."