There are a few great commands you can use to dissect firmware:

  • strings
  • od
  • dd

These links were helpful:

http://magick.org/rc9800i/

http://www.suburbia.com.au/~dan/

http://www.bitsum.com/openwiking/owbase/ow.asp?WL-530G#h3

http://student.kuleuven.be/~s0169612/isl3893.html

http://www.personal.uni-jena.de/~p3kima/aldi.html