I have the 3.1.2 and 3.1.3 .ipsws for the iPod touch 2G *MC* model. Currently, I am jailbroken and have access to the filesystem via SSH and USB. I have HFSExplorer to open DMG images. I want to add the native battery percentage toggle as well as some other PLIST based hacks to the IPSW so it is there when I need it unjailbroken. I try to open the first .dmg in the ipsw, and it says there is a password for it. The other 2 are "unsupported". Can anyone share their wisdom?