US Cellular Orbi lbr20 close to no download speed after recent firmware update.

I’m having the same issue I doknt know if it’s the firmware update though, I just bought this today. I have full bars when Setup. The upload speed is between 3mbps-9mbps and the download speed is 0-1mbps. I was told I would get 300 mbps, it’s never that good so I atleast though I could get into the 100mbps area but it’s not. Contacted US cellular support they told me I had good internet and to just find the optimal spot for the router. Didn’t really like that answer. So I contacted net gear support and they told me the same thing but to also check SIM card. I don’t have anything to check that though. Really felt like the past 4 hours has been a waste of time. Not very good internet for the high hopes I was given.