Unless you know the exact change that was made so you can revert it, I would do a hard reset.
You can always ask someone to export their stock registry and then import it into your device, but that will completely mess all the other entries made by other apps and settings you have applied on your device.
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Samsung Epic 4G - LegendaryROM / Samurai kernel
ViewSonic gTablet - Flashback Honeycomb Alpha 10.1
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