Echoing millions of others request, where is the update firmware to choose specific 4g bands?????!!!!!?????? and also on 4g+ bands tο choose 2 bands together???? Without this function, this router per

Where is the update firmware to choose specific 4g bands and also on 4g+ bands το choose 2 bands together put this on first priority And in Network mode addnew 4G+ mode only pls