**** fdtdump is a low-level debugging tool, not meant for general use.
**** If you want to decompile a dtb, you probably want
****     dtc -I dtb -O dts <filename>

Usage: fdtdump [options] <file>

Options: -[dshV]
  -d, --debug   Dump debug information while decoding the file
  -s, --scan    Scan for an embedded fdt in file
  -h, --help    Print this help and exit
  -V, --version Print version and exit