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Modify

You need a Linux PC/VM, Ubuntu as Operating System

Prerequisite

You need these program installed:

tar (extract tar package)
squashfs-tools (extract/repack rootfs)
qemu-user-static (run MIPS VM)

Extract firmware

Extract Firmware package in tar format, we need rootfs file
Extract rootfs partition

unsquashfs rootfs

Repack firmware

Repack rootfs

mksquashfs squashfs-root rootfs.new -b 131072 -comp lzma

Rename rootfs

mv rootfs rootfs.old
mv rootfs.new rootfs

Update md5sum

md5sum fwu.sh rootfs uImage fwu_ver > md5.txt

tar current folder

tar -cvf ../firmware.tar *