Using ROCK Pi 4   Troubleshooting

About the Troubleshooting category (1)
Keyboard Not working (5)
How to use RxD/TxD (pin 8/10) through /dev/tty*? (12)
Unable to connect wifi ap (13)
Rock Pi 4B reboot when I try to take a picture with the raspi cam 2 (1)
MJPEG hardware decoder not work correctly (1)
About the USB Gadget Legacy Method (1)
No video output (4)
Adjust Screen resolution (3)
ROCK Pi 4 resetted in stress test with USB3.0 and Gb Ethernet (4)
Setting 4k@60fps (4)
Google assistant on rockpi (1)
Broken sd card slot (3)
Ubuntu Server for RockPi4B 4GB (4)
RockPi4 LibreElec dptx.bin missing driver (2)