I had similar issues with trying to download recent updates to iOS 14.5 on my 7th Gen iPad and iPhone 8. They kept telling me I was on a metered connection, or not connected to the internet. I also saw some connection issues (slow downs, time outs, etc) on my Android devices (Note 20Ultra, Galaxy Tab S4, and even a Pixel 3).I updated my ax88u to 386.42820, and my iphone (ios 14.6 beta) didn't recognize I was connected to wifi, so it wouldn't let me download the 14.6 RC that just came out.
just upgraded iphone XS to 14.6 over wifi. no problems here
WiFi Agile Multiband setting in the router was already switched of so probably this is the reason things worked out.
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