2.4GHz WiFi provides slower speed after Firmware Upgrade
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So, I have been using Archer C20 router for my internet for more than a year now and It worked flawlessly during that time but over a month from now I had been having several internet speed and frequent disconnection issues, At first I thought It was an issue on the ISP's end and I tried using though Direct Cable but doing so I found out that it was not a problem from their end and afterwards which I contacted Customer Support for Tp-Link and they helped me with the issue providing with me some changes to my settings and suggesting a firmware upgrade, For which I complied and they helped me with the process but after doing said firmware upgrade, My 5GHz internet works fine but 2.4GHz doesn't work properly it provides slower speeds (both download and upload) in mobile phones and slower speed for upload in Laptop, Download works fine on the laptop using right now.
I contacted the customer care again and they informed me that it might be an issue with the channel which I suspected but after trying each channel some with varying level of success, It still doesn't work as it used to and one more issue is that the internet just doesn't work as good at a range where it used to before.
If you may please help me with this issue, I'll be grateful. Thank you.
That's great to know that the issue is fixed with the support helps.
As per the Transmit Power, you can find it on the Wireless 2.4GHz/5GHz > Wireless Advanced page as below:
If only one device is getting slower when connected to the C20 wireless, while others are getting normal, it is suggested to check if you can update the driver version of that device, or update its system, then check if that helps.