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So if you reset does not lose anything, I mean the pictures music, wasting applications on it which is not a problema.Il will reset to factory setting comes, bring your new gmail account and you will install applications on shop play without a problem, I often exchange phone, smartphone ....
I hope you `ve helped

You should be able to delete the first Gmail account after adding a second one. I've done that myself. If that doesn't work, then this isn't available on an older systems like Android 2.2.1, which is ancient btw, so reseting is the only way.

While you're at it, you might take a look, if there isn't an update available.