Baicells eg8050a help

|Product Name:|LTE-ROUTER|
|Product Model:|EG8050A|
|Hardware Version:|ver.A|
|Module Name:|EG12|

hello, I cannot change the lte connection type of the device. band 7 is active. I want to increase its coverage by setting it to low band. For example, I want to set band 28 700 mhz, 10bw. Sorry my english is bad.
Is there a website update available? The version he is using is probably old.