I decompress rootfs.gz, I have modified some files and then compressed rootf.gz with: find. -print | cpio-o-H newc | lzma e-si-so> .. / rootfs.gz
I added and rebuilt the iso LiveCD with the new rootf.gz, but when I try the new LiveCD with virtual machine, an error, which says that not exists ttyx, 1.2, 3, ...