Nighthawk M6 - How to configure for 4G only?

[lockwoodgh]

I just got the M6 6500 and am using it with an AT&T sim card.  It works great in some places, but at home we have a very poor 5G signal.  When it displays a 4G connection the up/down speeds and stability are several times better than when connected to 5G, so I want to block it from connecting to 5G.  I can't find any way to set the router to "4G Only" like I can do using an Android phone.  I am on the verge of returning the M6 and ordering a used MR1100 just to stop connecting to a 5G signal.  Anyone know if it's possible to set the M6 to 4G only?

[W1lliam]

try with tinyurl.com/mrCONFIGTools, ATT model does not open band region options, need to do this with extra tools