Resets don't get rid of google account info often (not factory resets). Hard reset should. Or you can try this....
NOTE: To do this you will have to enter the old account info first, to get past this screen log in issue. Then use the following info.
Try this to change your Google Account on your device. Without having to do a "Factory Reset" or "Hard Reset".
1. Go into your Tablet's "Settings".
2. Now scroll to locate, and then tap, "Apps" or "Applications".
3. In the Apps screen scroll right/left to locate the "All" tab, and tap it.
4. Now scroll down the list (which can be quite long) and tap "Google Apps".
5. Once in this new screen tap "Clear Data" and then tap "OK".
6. Next tap "Clear Cache" and then tap "OK".
Note: Your tablet may only have one or the other listed, that is fine. Also, while having both, it may gray out the other once you tap the first one, that is ok too.
7. Once you have done this, return to the main "Settings" menu.
8. Scroll and locate "Data Synchronization".
9. The tablet should prompt you to enter your new Gmail Account information.
If you don't have "Data Synchronization" you can just restart your tablet and you should be prompted to enter new Google Account info.