The below firmware versions are compatible with C-12 and C-08 cameras.
The zip file includes the Release Notes. Please check compatibility with your VMS provider before installing.
3.2.2. - The latest firmware for C-Series
3.1
2.1.5
For help on upgrading the firmware, please see the following guides
C-Series - Upgrading/Downgrading Firmware via Web Interface
C-Series - Upgrading/Downgrading Firmware via the Oncam Camera Configuration Tool (CCT)