i just looked at the signed firmwares that are available.
there has to be a some script or binary connected with the update mechanism. search for it. how does the update work normally? (i do not have such a box thats why i ask)
upload via webinterface? -> search for a script in the webinterface
or external tool? -> search for a strange looking server process
regarding optware feed
try to bootstrap manually to the optware feed:
i am quite sure that it works....if it works you can install loads of applications...its worth to do it. If all the binaries work then we can create another bootstrap-file so noone needs to do it manually afterwards.