I'm having the same issue, even after following advice above. Same platform, Nano pi M4 v2 Wiring debug pin1 gnd 0v to serial pin 5 ground debug pin2 5v no connection debug pin3 tx to serial pin 2 rx debug pin4 rx to serial pin 3 tx Power usb-C Nano pi spec says 3V level signals, pl2303 is 3.3. Perh...

New install on a clean build * Nano Pi M4 v2 4Gb, new out of the box * rk3399-eflasher-friendlydesktop-bionic-4.4-arm64-20200916 image on 8Gb Micro SD * No hats. Only peripheral is USB keyboard. Ethernet connected. USB-C power. HDMI screen. On boot shows the green & blue FriendlyElec GUI splash ...