I have a DS-2CD8253F-EI camera running the V5.0.8 130930 firmware. I upgraded once before to that firmware. I tried to upgrade to a newer firmware (5.1.0) which shows my camera as compatible, but it fails.   The only thing I haven't tried is a direct connection, I've been trying over wifi, but I'm fairly certain that's how I upgraded it the first time.   It basically instantly says in the status section: Upgrading Failed (using the web interface).   Through the Hikvision software it just doesn't do anything, no progress on the progress bar at all.   TIA!