Google Android has an automatic update service integrated that will ask you to update your version when a new one is available. This may be great for consumers - but it can be pretty annoying when you've just updated to 2.3.3 (Gingerbread) and then realize that you now have a testing device that is on a level that only 1.7% of your potential customers are on (see Google Android Platform Versions).
So how to downgrade your device?
Answer by jashan
Apr 05, 2011 at 10:34 AM
First of all: You do this at your own risk ;-) ... and you will lose any data on the device, as well as any settings. This will be getting you down to 2.2 - and so far as the update the phone offers would go directly back to 2.3.3, I have no way of getting to 2.2.1 for instance. After the downgrade is complete, you may want to disconnect USB (I found it a bit confusing because I got a screen with only one button "activate USB-filesharing" and now way to get out of there - except disconnecting USB). Finally: You'll want to re-active USB-debugging on your device after the procedure is complete.
The following steps are mostly taken from How to go back to Froyo from Gingerbread without unlocking the bootloader., with some notes added; there's other instructions for downgrading available on the Web but these are the most straightforward ones I found:
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