@Kevin_Z 

I have found the 2600MHZ band to be best for my area with the EE network and carrier aggregation. 

Using speedtest.Net, 1800mhz gives around 30mb while 2600mhz gives 180-200mb.

My Huawei router allows me to select different bands and this is how I have isolated each band for testing. 

@Richard_Love 

I also use a Huawei B525. I wanted to swap to the tplink 600 for the same reasons as you but with the current firmware limitations of the tplink there is not benefit. 

I have the same need. Think band lock is really a hygiene feature for this kind of stationary routers. All competitors have it, the router is almost unsusable if it roams to Swedish B3 (1800 MHz) or even worse B20 (800 MHz). Really looking forward to new or beta release. Band Lock via ISP file is also ok.

Br Stefan

We really need this feature.

So frustrating that modem changes bands itself and you cannot control it anyway.

If this issue will not be handled with fast firmware upgrades this will surely be my last tp-link product ever.

I thought TP-link would be a good company that values customers but 3 months and still nothing. 

Kevin_z, I really think you have to escalate this problem to the right people. You have a good enough product - except for this showstopper.

R&D should of course do their own feasibilty study. Roaming algorithms can be hairy, changes might be subject to type approval or customer acceptance etc. But the change itself, to exclude candidates based on LTE band, can't be that complicated.

As for the end user need, this setting is absolutely necessary in many countries. Hygien feature within telecom market, please benchmark with your competitors...

In my experience, if a feature has high market value and is easy to implement, you should really go for it ASAP and also make sure not to forget it in future products.

Finally there might be that some telecom operators (especially the support organisation) dislike this kind of advanced settings, since they are afraid of massive amount of support calls caused by wrong setup... Even so I belive that the operators market organisations would be happier if their network works. Anyway could be a good idea to "hide" the feature in advanced settings. Maybe even with a disclaimer, saw something like this on a ZTE Mifi: "Dont change this setting unless you know what you are doing" :-)

For me personally it would be fine with a beta release or some other type of config file/cmd, but the important thing is you urgently need to adress this.

The problem wont go away by itself, and as long as you don't fix it you will have this complaints hurting both your brand reputation and limiting sales.