I'm very interested in this too. I have tried many different fw, 5.3 english & chinese, 5.4, 5.4.5 they simply don't work.
Even after the mtd hack, these cameras only work with the 5.2.5 (or 5.2.8).
If anyone figures out a way to get 5.4+ fw on these camera, please share !!
we need to get gmail...