You need to install DT compiler from : http://ftp.debian.org/debian/pool/main/d/device-tree-compiler/device-tree-compiler_1.4.7-3_arm64.deb   Backup /boot/dtb/rockchip/rk3399-rockpi4b.dtb into /boot/dtb/rockchip/rk3399-rockpi4b.dtb-ORIG   Decompile the DTB into DTS : dtc -@ -I dtb -O dts -o rk3399-rockpi4b.dts-4.20.0 /boot/dtb/rockchip/rk3399-rockpi4b.dtb Edit the file rk3399-rockpi4b.dts-4.20.0 by changing all the serial node from "disabled" to "okay", then recompile
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