Loader Version 1.20
System debian buster https://dl.radxa.com/rockpi4/images/debian/rockpi4b_debian_buster_xfce4_arm64_20210608_1321-gpt.img.gz
After clicking Restart, the screen is black, only the yellow light is on, and the keyboard and mouse do not respond. The serial port is lost, and Uboot debugging information is not displayed.
The power supply must be disconnected and then plugged in again to start normally.