I bought one of these little things, mostly to be able to get an LTE connection when I'm traveling, and the rest of the features were a great value add. It's b

I bought one of these little things, mostly to be able to get an LTE connection when I'm traveling, and the rest of the features were a great value add. It's been very helpful so far for the WiFi repeating and being able to override the DNS across the board, however, I've struggled to find a decent LTE stick for it. I bought a Huawei E3372-325 LTE stick, but unfortunately it doesn't work properly. Having searched for the issue, I'm not fully understanding what needs to be done. I'd love some suggestion for a decent stick that works with OpenWRT. I've struggled to find a good resource for this where I can narrow down products that would work with it, and suit my needs.