The Sprout motherboard replacement for iPod fits inside an original case and uses its screen and click wheel for navigation. There's no soldering, and best of all, it uses a microSD card for storage, like most of the mods for iPods do. There are models coming for iPod 3rd gen, iPod mini, and iPod 4th gen.
https://certainthin.gs/sprout
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Source: AppleInsider · Summarized by HeadlinesBriefing