Reformat from iPhone OS4 to OS3

I updated my iPhone OS to v4. Since then, I have been having problems with the hard buttons. Sometimes the power/lock button doesn't work, sometimes the home button doesn't work. Not at same time, thankfully. This started to happen after upgrade to OS4. I would like to reformat my iPhone to its original operating system.
Can you please give instructions on how to do this?

1) It happens... no big deal
2) Settings > General > Usage > Battery Percentage, simply turn it on.
3) is there a 3rd issue?
If you are experiencing multiple problems, you can restore the device using a backup to see if that resolves the issue.
The next step would be to restore as new and NOT use a backup to see if the problems are the result of "bugs" in your backup.
Beyond those solutions, search google for ways to revert back to iOS3.x. Apple does not and will not allow roll-back to previous versions.

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Mobileme Expert: To be honest iPhone User we have been having a lot of issues with the new iPhone 4's syncing with the MobileMe. I would not be surprised if there isn't a new update currently in the works.
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Mobileme Expert: Go ahead and turn off the device for us now please.
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Mobileme Expert: Make sure we leave the device off however.
Mobileme Expert: Go ahead and go to the MobileMe Control Panel now please.
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Mobileme Expert: Go ahead and Reset Sync Data> Ensure that the "Arrows" are flowing from the Computer to the MobileMe Cloud please.
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IPhone User: What should I do?
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Mobileme Expert: Do you see the option to "Reset Sync History?"
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IPhone User: Done with Status: Syncing Mobileme running
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Mobileme Expert: Go ahead and re-add the account for us now please.
Mobileme Expert: Can you tell me if the all the "Sync tabs" are currently in the "On" position or not please.
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Hello KatTreeRain,
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Hi
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 Cheers, Tom

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Reformat from iPhone OS4 to OS3

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