PrePVT iPod Touch 4th Gen runs an InternalUi build that’s an offshoot of 4.1GM. Quite rare to find anything this old Additionally the build seems to be compatible with Touch 3/4 and iPhone 3G/3GS/4pic.twitter.com/HUhI3TgxAl
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The firmware would probably be easier to get. I have it but it’s broken and I’m not going to share it for anything since it’s a personal favorite internal firmware of mine. Imo trying to get software is smarter though since any hardware will eventually fail and is pricier.