Download the  lzs compress and decompress tools from http://git.kopf-tisch.de/?p=zyxel-revert;a=summary

[email protected]:~/Desktop# tar -xzf zyxel-revert-779bfd5.tar.gz
[email protected]:~/Desktop# cd zyxel-revert-779bfd5/
[email protected]:~/Desktop/zyxel-revert-779bfd5# ls

rom0-1

Compile the source code with makefile.

[email protected]:~/Desktop/zyxel-revert-779bfd5# make -f Makefile

rom0-2

[email protected]:~/Desktop/zyxel-revert-779bfd5# ls

rom0-3

To decompress rom-0 file

[email protected]:~/Desktop/zyxel-revert-779bfd5# ./decompress /root/Desktop/rom-0

rom0-4

The result of decompressed file is rom-0.decomp (original-filename.decomp). Show printable strings from decompressed file.

[email protected]:~/Desktop/zyxel-revert-779bfd5# strings /root/Desktop/rom-0.decomp

Password usually on first line