In case Google Play Licensing service reports that your license is invalid and you bought our application, then it can be caused only by two things:
- Either this is a temporary issue on the Google Play Licensing servers. Please try rebooting your mobile device, make sure you are connected to the internet and press the invalid license button available in upper right corner of Mi Band Tools.
- If the issue persists, it's probably caused by some application that is installed in your system and that is tampering with Google Play licensing services. Please remember that usage of such application is against the Android policy you agreed to when you started using an Android mobile device. To resolve this issue, simply disable or uninstall any application pretending to be Google Play Services.