Most stock S805 Lollipop builds are not fully rooted. Download Kingoroot (APK version) to remove bloatware like pre-installed Live TV apps from China.
While many original links from 2017 are now dead, these platforms historically hosted the "hot" downloads: MXQProject : A major hub for Amlogic firmware updates and tutorials. LibreELEC Forums mxq amlogic s805 android 511 lollipop hot download
: Use TWRP's Backup option to save your current system to an SD card before starting. Most stock S805 Lollipop builds are not fully rooted