How are you trying to upgrade the firmware
If on the web GUI and pushing the upgrade button that won't work
You need to find the correct firm ware for this camera
Down load the file then say open that file to your desktop it will be called
digicap.dav got to the camera web page then under maintenance you will see upgrade browse to the file on your desk top digicap.dav click on it the click update in the web GUI a little box will open up with a small red line and % then when done the camera will reboot and the latest firm ware should be on the camera but please make sure you have the correct firmware first or if it's not broken leave it alone new firmware doesn't mean the best functions and features have been added far from it