Using the usb port at USB2 speeds will immediately solve the interference. I guess you have to choose between fast transfers and wifi, but in applications like SAMBA, DLNA and NAS you will not see much of a regression, moving from USB3 to USB2 devices.
My two cents.
The drivers for the usb3 port should provide backward compatibility for a usb2 disk with no modifications to the router.
You should simply try with an older usb2 hdd case, and see if your problems are solved.
Alternatively, if an old case is not available, what you quoted for ehci hcd is fine, but somewhat more drastic to do.
I’m sorry for your inconvenience…I feel it.
I was in your condition too, and learnt the hard way that nothing is better than a router with an esata port.
The slower transfer speed is the drawback you will have by using usb at only 480Mbit/s, but you will not have interferences with 2.4Ghz wifi.
If you want USB3 speeds AND wifi, you can only use 5Ghz frequencies, as they are not bothered by the USB3 operation.
This is the situation with usb3 and 2.4ghz frequencies:
The radiation from the USB 3 chip on the router board, the usb cable and the USB 3 device you use will affect the WiFi chip running 2.4ghz. THIS IS A FLAT FACT. NOTHING WE CAN DO ABOUT.
you can try and insulate those components, using some metal as you did
you can use the port with slower devices, with USB 2.0 protocol (don’t need to downgrade the driver as only the radiation from USB 3.0 signal will affect WiFi. USB 2.0 signal is fine)
you can only use 5ghz WiFi, as it is not disturbed by USB 3 radiation, but yes, some devices lack 5ghz connectivity, I know.
or else, some manufacturers pay attention on where and how they locate the usb components on the board, in order to minimize the interference when usb is working at the same time with 2.4ghz wifi
One last thing you can try is to see if all 13 channels (or how many you have on the Flint) of the 2.4ghz radio are affected by the radiation from usb 3. You might discover that one or two channels can operate better than others.
No it’s a issue as is. I have many asus routers also, ac and ax models with same problem (with merlin and without this). Including tp-link, tenda…etc. All of them have issues with 2.4Ghz wifi because usb 3.0 and wifi jobs frequencies and resonances are very similar. It’s true that depends alot of in hdd and cable shuields. Sorry for my english.
Asus runs on asuswrt merlin and the flint on openwrt. No matter how, the problem does not exist with the same hdd hardware with the asus. Unlike the colleague said that it is all the same with the disturbances