I have upgraded to PRO version, but it now reverts to the free version and displays ads.

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It's the known issue of Google Play.

Please follow the steps below to restore the transactions:
1. enable the mobile data (not Wi-Fi) connection and make sure your Internet connection is available
2. open Google Play Store app and make sure that you can browse apps
3. open our app (FREE version) > MENU > Upgrade to PRO version or tap the top shopping cart toolbar icon > MENU > Restore transactions

If it does not get the license, please continue trying the following steps:
4. visit Launcher > Menu > Settings > Applications > Manage applications
5. tab over to "All"
6. select the Google Play Store app, and then tap "Clear data" and "Clear cache"
7. select the Google Play services app, and then tap "Clear data" and "Clear cache"
8. repeat step 1 to 3

If you still have a problem to retrieve the license, please continue trying the following steps:
9. uninstall our app
10. reboot the device
11. install our app from Play
12. repeat step 1 to 3

If you have added multiple accounts to the device, please:
13. uninstall our app
14. reboot the device
 15. open Google Play > top-left navigation menu > select account that you used to purchase apps as the active account
16. install our app from Play
17. repeat step 1 to 3

The license should be retrieved from Google Play in step 3. If it does not, please email me the error message of step 3.

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