AIO 6 LTE cannot be updated via Wifi

AIO 6 LTE cannot be updated via Wifi

Hello,

I am running into an issue with trying to update the AIO 6 LTE via Wifi. It does not appear to work at all for me, as the guide suggests I have to go to [Settings] - [System update] and connect to the WiFi. However I am not sure if it is due to the severely outdated version I am running, but the whole [System update] tab does not exist. The only one similar to this is called [Update] and this one only appears to be related to manual SD cards updates.

I had to manually update my device, as the updating via WiFi does not seem to exist or work in any way. Is this a known issue that this doesn't work?