The process of returning to a previous version of installed software -- e.g. from a custom ROM to the original stock ROM for warranty issues, or from a newer Android version to an older one.

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how Downgrade LG optimus P500 from 2.3.3 to 2.2.2

I upgraded my LG optimus P500 phone from Android 2.2.2 to 2.3.3. After upgrading the battery started to dry very soon and it auto powers off as well even when the battery is more than 80%. Now I ...
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Downgrade 2.3.6 to 2.2.2 - Nexus One

I would like to downgrade my Nexus One to 2.2.2, because I've had non-stop problems with Gingerbread. I have the 2.2.2 update from android central, and going off the comments from a previous question, ...
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Downgrade to official LG GT540 2.1updated

I've installed Android 2.3 (Cyanogen Mod) to my LG GT540 phone, but it's too unstable. I would like to downgrade back to 2.1update (it's the OS I have when I buy the phone), or any official newer ...
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Can I get back to root-able HBoot version by doing a factory reset

I have a HTC Wildfire (Buzz) that originally came with Eclair. I now have Froyo on it and the Unrevoked tool doesn't work as the HBoot version is not supported (too new for Unrevoked). At this point, ...
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Is there a way to “downgrade” (revert) an HTC Desire HD to stock Froyo from Gingerbread?

I don't have any backups or whatever. My phone isn't rooted. It updated to Gingerbread 2.3.3 OTA a couple of days ago, and I hate almost every change that it introduced. Thanks.