Installing apps from unknown sources bypasses Google Play Protect, leaving your operating system vulnerable to rooting exploits or data theft.
The phrase "holo flash projector" can be a bit of a catch-all. At its heart, it refers to Android apps designed to work in tandem with a physical projector setup, often of your own making, to create the illusion of a 3D hologram floating in mid-air. holo flash projector app download for android extra quality
If you want to view content on a larger scale, use these legitimate methods: Installing apps from unknown sources bypasses Google Play