Today I tried upgrading one of my CIVS-IPC-2500's firmware from 1.1.1 to 2.1.2. I used the web interface and it said it completed successfully and then rebooted, however when it came back up, it says, "Firmware crash! Please upgrade camera to the latest firmware version and follow through the firmware upgrade procedure"
It then gives you a screen to select a new bin file and do the firmware upgrade again. I've now tried 2.1.2, 2.1.0 and 1.1.2. All with the same result.