I actually verified the problem of `` Wi-Fi becomes unstable at a specific resolution '' of Raspberry Pi 4 - GIGAZINE
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Amazon.com: Miuzei Raspberry Pi 4 Touchscreen with Case Fan, 4 inch IPS Touch Screen LCD Display, 800x480 HDMI Monitor for RPI 4b 8gb/4gb/2gb with Touch Pen (Support Raspbian/Kali/Octopi/Ubuntu)- No Raspberry Pi :
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How to fix and unbrick HDMI output on Raspberry PI model 4B and perform Recovery, 2 methods - YouTube
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