If you want to update Arlo firmware manually then here is process
Open Arlo app on your device or visit my.arlo.com
Go to Settings > My Devices.
Choose the camera you wish to update
Navigate Device Info > Firmware > Update.
Alert: while the Arlo firmware is updating dont remove or open the battery
Wait until the firmware update is finished
The LED on the camera flashes blue and amber during the firmware update. After that, the camera LED switch off for 1-2 minutes at the same time the firmware installs in the camera. When the camera firmware complete, the base station sync with the camera again and the LED flashes blue quickly.
Repeat the process for every camera that you wish to update
Note: This is for Arlo Ultra, Pro 3, Pro 2, Pro, or Wire-Free. For other models of the camera, you can check on the internet.