I had entered some things in Make it mine, where normally iPod is standing... Now i've upgraded and losed my jailbreak, but i don't have the iPod again How can I fix this?
did you restore from a backup? if so, restore again, and set up as a new device.
or using backup manager, find springboard.plist and edit your carrier. (google 'change iphone logo without jailbreaking') this works with the same idea