@benparker I made my concern in the "Live chat support" (https://livechat.tp-link.com/fi/routers/) and they delivered the firmware as a downloadable file there for me. If you give references to these...

@darant From support, I got the beta firmware for another model (MR4600) and after updating it gives me options for selecting bands (1 to 40). Does the reference list in this thread for bands apply...

@john.awad Oh you are right! My router model has extra cursed 4! No discussions for my Router model for band changing. And here is my discussion with tp-link chat! Me: My 4G operator suggested to...

@darant I wanted to try the firmware to do change the Bands. I have "TL-MR6400 v4 00000001" and when trying to upgrade I got "Error code: 4503 The uploaded file was not accepted." So should I be...