This site has a nice step-by-step instructions for firmware reverse engineering of a Linksys WAG120N:
http://www.devttys0.com/2011/05/reverse-engineering-firmware-linksys-wag120n/
In this site I discovered very interesting tools:
Firmware Mod Kit: http://www.bitsum.com/firmware_mod_kit.htm
ZX Utils: http://tukaani.org/xz/
Until now I didn’t need any special tool, because the IP Camera H6937WI is easy disassemble đ
Alan C. Assis 