@bpwl
I took your advice since you are more competent than me, and I disabled CAPsMAN, put my downstairs AP to WISP AP mode, bridge, not the router.
This is the screenshot of a quick set in downstairs AP (Note: It won't let me change the country and it has only a 5GHz band but I configured each interface manually anyway, not through Quick set)
Downstairs AP new config pic_1.jpg
Then I set SSID, one for 2.4 and another one for 5GHz (Note: Main router 2.4GHz interface and downstairs AP interface have the same SSID. And the same is done for the 5 GHz interface)
Downstairs AP new config pic_3.jpg
I don't know which setting to use for channel width so I put these for testing, aaaand it's working like a charm.
As you can see below, in the registration table of the downstairs AP, the first device is my older laptop with only 2.4GHz, but the second device is my mobile phone that connects with maximum speed.
(Note: there is a solid brick wall between AP and mobile phone)
Downstairs AP new config pic_2.jpg
Here are the settings for the main router
Main router new config pic_1.jpg
Now, is it possible in connect list to add devices and then via signal strength force device to connect to another AP? For eg. when I go upstairs signal level drops, I can test to which level signal drop and then put a slightly stronger signal value in the router at which the router disconnects the device. Then the device will connect to another AP which have the same SSID.
@WeWiNet
Is there any diference in setting up wireless with that extra package ? I would like to give it a try.
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