I have opened a thread 8 month ago about this issue. It’s here: I found out that the problem could be solved with another router. I have bought it, but didn’t find the time to install it until now. This is the router: 5G Cheetah - Wi-Fi 6 Router.
You can disable the WiFi with a script in the Powershell from a Windows PC or with an Android App. Just Goggle...
With the current poor firmware you cannot change it.
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