RBR50 - Download is slower than Upload

[Accutronman]

Have ATT 1gb fiber with RBR50 in router mode connected to Pace modem set to DMZplus mode. Running the Internet speed test within the Orbi app, I’m getting average upload speed of 800-900mb but only an average download speed of 560-570mb.

Any suggestions on increasing download speed?

[FURRYe38]

What Firmware is currently loaded?

Orbi app on a mobile device? 

If so, then the orbi is working to spec...

What are your LAN cable connection with a PC speeds test at? 

[gr8sho]

The 5268AC has had numerous issues with DMZ mode. I’m surprised you’re even getting those speeds TBH.