: Outdated TLS security protocols on Android 5.1.1 sometimes struggle to negotiate connections with modern web servers.
What is the of your Android 5.1.1 device? : Outdated TLS security protocols on Android 5
Android 5.1.1 requires a manual setting adjustment before it allows you to install files from outside the official store. Follow these steps to prepare your device: Open your device . Scroll down and tap Security (or Lock Screen and Security). Find the Unknown Sources option. Toggle the switch to On . Tap OK on the warning prompt. How to Find the Best Verified APK : Outdated TLS security protocols on Android 5