So I'm planning on upgrading my jailbroken Ipod Touch 2g 2.2.1 to 3.1.2.. I've heard that the safest way is to restore my ipod first. Because of my crappy internet connection, it's taking forever to download the software update on itunes. However, I still have the custome firmware I downloaded ages ago when I jailbroke my Ipod. Is manual restoring instead using the custom firmware okay before upgrading my ipod?