SIM 2 has no LTE?

[paulakreuzer]

Only one SIM card can be set up to use 4g.

Please check out the following topic and continue there if you have the same issue:

Dual sim after marshmallow update?

Hi All, Since upgrading to marshmallow my phone only has 3G and 4G as options for the first sim slot. Previously, I could set the first sim to 2G and then my second sim to 4G but now that I can’t set the first sim to 2G, my second sim is stuck in 2G. Since I travel between two countries frequently it was really useful to be able to swich which sim uses 4G with out taking the sim card out. Is this a marshmallow problem? Has anyone had similar problems? Is there a way round it? Thanks, Lorna