Android 5.1.1 requires manual permission to install apps from outside the Play Store. Go to > Security . Scroll down to Unknown Sources . Toggle the switch to On and tap "OK" on the warning prompt. 2. Check Your Architecture (DPI and Arch)
To ensure your download is verified and free of malware, stick to reputable APK mirrors. Avoid "modded" APKs that promise free paid apps, as these often contain hardware-draining scripts or spyware. Use: Android 5
If you’ve installed a "de-bloated" firmware, you may need to side-load the Google Services Framework manually. Android 5