...Do you know if I can reflash this with the firmware of one of the other models listed on this website?...
Doing so will most likely brick the camera. You should contact the manufacturer's support and see if there is a firmware update.
the camera itself does not work particularly well
Get a Foscam or WansView - they do work particularly well.
P.S.: Did you look on the vstarcam website? The SERVICES tab has a download item "
materials for updating TF card" that contains a new firmware load complete with instructions. It holds two versions:
V1
Firmware Version: 0.0.0.1.xx
Embeded Web UI Version: v32.0.0.xx
V2
Firmware Version: 0.1.0.2.xx
Embeded Web UI Version: v32.1.0.xx
Good Luck!