My Redmi Note 9 Pro Max is not tethering with my tp-link MR3420 3G/4G USB router - Redmi Note 9 Pro Max Questions & Answers

All other phones tether with this router over USB without any problem. And my Redmi Note 9 Pro Max tether with computer/laptop over USB without any problem but its not tethering with my tp-link MR3420 3G/4G USB router. My mom's Realme and my old redmi note 1 tether with this router without any problem but my Redmi Note 9 Pro Max doesn't tether with this router
Is there any setting I need to change?
Please help

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Extremely slow WIFI Connection link speeds

Hi all,
I've recently purchased 2x Xiaomi Redmi Note 8 Pro's and I've noticed that the WiFi link speeds are hilariously slow for such a modern phone.
2.4g seems to be limited to a max 72mpbs and 5g is limited to 433mbps. Now, before you say 'it's your router grumblegrumble' it isn't. It's a VMG3925-B10B and its capable of much faster wifi link speeds and I know it is because my older LeEco LEMax 2 got a lot more, so do my laptops, and Ipad. Even my 10 year old Dell 1520 gets faster than 72mbps.
So, now that is out of the way, what on earth is going on? I'm certain that this modern phone must be able of quicker wifi speeds especially considering it's reliant on wifi for connectivity?
I've tried entering the mediatek engineering mode on the phone but can't get into the wifi options (wifi needs to be off, operated too much, constant search on etc) which are all set correct but still doesn't let me in.
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Well I have on my router about 36MB/s on 5Ghz.
Redmi Note 8 Pro should also support simultaneously connection on 2,4 and 5 GHz WiFi. But not enabled right now for some reasons.
Generaljan said:
Well I have on my router about 36MB/s on 5Ghz.
Redmi Note 8 Pro should also support simultaneously connection on 2,4 and 5 GHz WiFi. But not enabled right now for some reasons.
Click to expand...
Click to collapse
Unfortunately your speed test doesn't mean squat because it's only testing your broadband connection. Not the WiFi link speed between your device and router.
It doesn't seem like there's any extended bandwidth capabilities?
remi note 8 pro wifi speed problem solved
turn off the bluetooth when using wifi. speed will be fine.
karan989898 said:
turn off the bluetooth when using wifi. speed will be fine.
Click to expand...
Click to collapse
Who was using Bluetooth while using WiFi?
I watch youtube with BT earphones for example, internet is god damned slow, 144p loads for minutes even on 4G... That seems to be a problem of software. Disconnecting BT brings internet back
On a redmi note 8 miui 12 try this: go to settings/location and turn off wifi and bluetooth scanning

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