Solved RT-AX86U dead WiFi asking for country code?

[Ripshod]

No. ASUS power adapters are global 100-240V 50/60Hz.

Agreed, but if that adapter is already failing due to age the power demand could trigger this.

 

[Tech9]

the power demand could trigger this

Power adapter is unrelated to channel selection and Tx power. If the power adapter is failing the device will most likely glitch with sudden restarts, won't complete the boot process, etc. And it has to be really bad already since nothing inside needs 12-19V, all VRMs to much lower voltage and very low power demand under 10W total (with no USB powered drives). This router has different issue.

 

[ColinTaylor]

As you said, -70 dBm is far too weak. I would expect something like -40 dBm or better.

Is the 2.4 GHz channel equally weak?

 

[Squall Leonhart]

Good evening. I have an Asus RTAX86U router purchased in Portugal where the Wi-Fi worked perfectly. After moving to Brazil, the Wi-Fi signal lost strength; I can only connect my devices if I'm within 1 to 2 meters of the router. What could be the reason for this? Is there some kind of wireless restriction due to changing countries? Could malware be causing this on the router? I've already tried several Asus and Merlin firmwares, and nothing changes. Currently, I'm using firmware 3004.388.11. @ColinTaylor Can you give an opinion? tks

concrete housing

I stand corrected.
The figures look good so nothing wrong in the configuration.
One thing occurs to me. In Portugal mains power is 230V. In Brazil it's 127V with 220V available for higher power devices. I'm wondering if higher current demands on the psu is causing it to struggle on 127V(?). Voltage is halved so current has to double for the same power.

why would it? its a 100v-240v switching adapter

Router only ever see's the DC 19v output

 

[ColinTaylor]

Equal

Given the channel problem we discussed privately I suggest you temporarily remove the AIMesh nodes from your router (or turn them off), reboot and see if things improve.