I have a Nighthawk RAX80 and I updated to the most recent firmware update // 

Firmware Version 1.0.10.140

Wifi speeds dropped from 800 up and down to barely over 100.

I tried reverting to the old update but that didn't fix the issue and I'm not sure what I'm doing.  I need some help from someone smarter than me.

I'm including a screenshot up the old firmware and new firmware I updated to as well as the speed test from 2.4GHz, 5GHz, and Wired in that order for reference if needed.