$ apt install device-tree-compiler
pacman -S dtc
$ dtc -I dtb -O dts <IN-FILE-PATH> -o <OUT-FILE-PATH>
# -I dtb: Input format is Device Tree Blob (dtb)
# -O dts: Output format is Device Tree Structure (dts)
# <IN-FILE-PATH>: The *.dtb file you want to decompile
# -o <OUT-FILE-PATH>: The *.dts output file
# Ex. dtc -I dtb -O dts ./arm-virt.dtb -o ./output.dts