Changing Network Mode to 4G Only Speeds Up my internet

Credit to user @anhm83 for sharing the solution below with other users in the community.

Model Number: Archer MR600

Hardware version: V2

Firmware version: Archer MR600 (EU)_V2_210208

Hi All,

I have an Archer MR600 V2 that has super slow speed. The download is 1Mbps, and upload is just 0.5Mbps!!! I struggled with numerous troubleshooting, I tried to reboot the device, reset, select the 4G band manually, etc., but no help.

Then I found out that the Network Type of the 3G/4G on the MR600 web page shows WCDMA. It seems that the Archer MR600 fails to synchronize 4G network. I went to the Network settings page under Advanced page, changed the Network Mode to 4G Only, Bingo, that's it, the speed now is back to normal.

This is where I changed it, remember to save it:

I hope this solution helps others as well. Good Luck.