Please how to installed new update firmwire

My Archer VR2800 has started to behave very oddly. Right now I am using it to access the internet, but the device's utility tool says it is disconnected from the internet. I have it configured as a br

I cannot access my device and control it. It asks me for the ID and password and I enter everything. I tried all the solutions and they did not work. I want your help or a support team to contact me.

I have the TL-WR940N and I would like to let only one, known wired device (one MAC address) have internet access (i.e. have a whitelist), but then I'd like for any device to be able to connect to WiFi

Is it possible to deactivate wireless networks via SNMP or change settings at all? What are the parameters for this?

I cannot find my device in the list WiFi +5g or 2.4g cannot connect