Note: Please check the system firmware version of your camera before the upgrade, if the first three sections are the same as the one you want to upgrade, you can upgrade without problems, if they are different, do not upgrade it, otherwise your camera will be "not useful" and must be shipped for repair! Each Zip file with firmware contains "Read me" and guidance for the upgrade. Some models include new feature in the firmware, which you should read about before upgrading.
Note: The warranty on the product lapses if this is due to a firmware update has gone wrong.
New firmware available for download on the manufacturers website - see them in support - here
Bosch
Firmware - Download
Geovision
Firmware - Download
Hikvision
Kamera Firmware - Download
NVR Firmware - Download
Zavio
Firmware - Download
Foscam
Firmware - Download
Dahua
Firmware - Download