Wow! upgrading my monowall IDE compact flash (CF) card from version 1.21 to ver 1.22 took me quite a while to get around. I made sure to back up my original monowall configuration on the CF using the restore/backup feature on my pc, an xml file of about 27kb and then set about upgrading it.
Marten vijn sent me some directed to the monowall mailing list but didnt find much help, http://m0n0.ch/wall/list/?action=show_threads&actionargs=200406#%2Farchive%2F64%2F39
The installation instructions didnt really show me on how to upgrade, http://m0n0.ch/wall/installation_generic.php
Well, googling around a few times, i came across a good doc with a screenshot and finally everything seemed to be very easy! I was looking on how to purposely use physdiskwrite in windows to write the image file on the CF. And here is where i found the answer, http://www.oreilly.com/catalog/wirelesshks2/chapter/hack71.pdf#search=%22using%20physdiskwrite%20windows%22
Following the instructions in the hack and the monowall website, i finally manged to get my CF card upgraded to ver 1.22. And instead of reconfiguring everything again in the new version, I restored the old xml file, backedup earlier, and soon had a kool working system with no problems at all.