Band locking

Team Mobile team - A couple of options that I would like to throw by you all:
1. upgrade the firmware on the T-Mobile Home internet cylinder device to allow for band locking (or in my case, to allow turning off the primary and leaving the secondary on.  I have a good signal for 5g, and and bad signal for 4 g.  I have tried an external antenna.  When I am set with n71 on my secondary signal, it gets 3 bars (on the 192.168.12.1 router browser screen) and I get 1 or 2 on the primary which is on B2.  The darn unit will sometimes go to 'Connection Lost' and kill my internet connection.  I know if I could get it to ignore the B2 band, and stay on the n71, I would have pretty good internet.  This is basically the best option for me - would greatly appreciate this being made a possibility.  I appreciate anyone taking the time to look into this and let the community know if this will be a possibility anytime soon.  Or if someone has an alternative out there to be able to lock bands and still be able to use the T-Mobile home internet plan / device - please let me know.