speed is slow?
My UniFI 30/10mbps router is also using DIR 850.

mind telling me what kind of device you are accessing the router with? smartphones? ipads? desktop? laptop? etc

all my smartphones, ipads, PS4 & laptop can get around 27-30 mbps speed.
but sometimes my desktop pc can get up to 10-15mbps only. but this is due to my desktop is using Dell wireless adapter, which is known to have low reception problem.

what i did was, i tweaked some settings inside it, especially on antennas & channel strength, and i can get vast improvement. can easily get 27-30mbps now.

Right click on the Wifi logo in your Win 10. choose Open network & sharing center.
Then choose Adapter settings.
Double click on your Dell Wifi adapter. Go to Settings.

Unfortunately, even after tweaked, sometimes i find the speed dropped back like i mentioned earlier; 6-7 mbps.

just today, i went to a pc shop, bought the Dlink N high gain USB wireless adapter, disabled the damn Dell wireless adapter, installed the Dlink's and now my speed is always maximum, all the time!

RM75 only.

so, anybody faced any problems after updating to new firmware?