M20: How to replace reflect glass for vivicine M20 Projector

thank you Vivicine Official web: 50% off Buy On Aliexpress:50% off Best Buy Link:50% off Top Brand Vivicine M20 Full HD Projector Difference Between M20 Basic and M20 Pro M20(Basic Version) ● System: Multimedia system,No android,Support AC3 and Dolby M20 Pro (Smart Version) ● OS: Android 9.0 ● CPU: RK3318 Quad-Core 64bit Cortex-A53 ● GPU:Penta-Core Mali-450 Up to 750Mhz+ ● RAM/ROM: 4G RAM+32G ROM/64GB ● Bluetooth: BT4.0 ● Screen wireless push: Airplay/ Wifi-display(Via Miracast APP) ● Google play store: Download and install APP Optical parameters ●Brightness: 6500 Lumens.(650 ANSI Lumens) ●Resolution: Native 1920x1080pixels full HD ●Contast ratio: 1000:1,Dynamic 4000:1 ●Dispaly technology: 6.0" Liquid Crystal Display ●LED Lifetime: 30,000 hours ●Throw Ratio: 1.5:1 ●Keystone Correction: 4D Electric keystone( horizontal +/-50 degree)vertical +/-15 Degree Interface ●Input: USBx1/USB out 5V x1/HDMIx2/VGAx1,AVx1, ●Output: 3.5 mm Earphone Other Hardware ●Speakers: 4Ω,5W ●Projection Screen Size (inch): 1.55m-45.5" 2m-60" 3.5m~109" ,4.5m~141",7M-200" ●Best projection Size (inch): 60-150 inchs ●Projection Distance (m): 2.5~ 4.5 meter Projector Weight and Dimension ● Projector Dimension: 232*308*104mm ● Packing Box Size:345*325*145mm ● Net Weight: 2.74kg Important note about video decoding: *.avi--MPEG 1/2/4 decoded to 1080p@30fps,max: 20Mbps *.mkv--H.263 decoded to 1080p@30fps, max: 20Mbps *.mp4--H.264 decoded to 1080p@30fps ,max...