Oftentimes developers build a test version of an APK by setting testOnly to true in the APK's manifest XML file.
This type of build is intended to be installed via ADB only.
If you upload such an APK to the Esper Cloud, it will upload successfully.
However if you try to install a test app on a device using Esper it will fail with the error message INSTALL_FAILED_TEST_ONLY.
In this case your two choices are:
*Install the app locally using ADB.
*Change testOnly to false, rebuild your APK, upload it to Esper Cloud. It should then install on devices without error.
you can check installation steps here pirlo tv online and I hope you will not have eny error again regarding to installation