Usually wifi is limited to the device you're using and the area you're in.
The R7000 can get its firmware downgraded. You simply download the firmware you want, extract it, and then follow the manual firmware update process. Do it over a hardwired connection and factory reset the router afterwards.
Not saying this is going to help your speed bit it might
There are lots of variables to affect wi-fi speed. They range from the environment you are in to the device your are connecting to and to the speed test site you are using. The environment includes the construction of the building and other equipment in the proximity that transmitts electromagnetic signals.
In general, if you obtain around a 100 Mbps download speed on the 2.4 GHz band and around a 300 Mbps download speed on the 5 GHz band you are as good as you are going to get. Of course there are always exceptions and always someone trying to one-up your numbers.
Yes, you are in error to expect 400 to 500 Mbps wi-fi speeds. See numbers in my previous post. If you are presently getting 250 Mbps speeds, consider it good and stop while you are ahead.
When you download the previous firmware file, it comes in zipped format. You have to unpack it from the zip file and place it on your computer in the uploadable format. The stand alone file format is .chk. You cannot upload to the router while still in the zip file. Be sure and do not try to flash firmware over a wi-fi connection. An extremely high probability of a bad result if you do. Also remove any USB drives connected to the router before flashing the firmware.
Model: R7000P|Nighthawk AC2300 Smart WiFi Dual Band Gigabit Router
In the world of wi-fi you are pretty much at the edge of the technology. In general, if you obtain around a 100 Mbps download speed on the 2.4 GHz band and around a 300 Mbps download speed on the 5 GHz band you are as good as you are going to get. Direct through ethernet and a 1 gigabit option from your ISP you should get around 900 Mbps.
Not sure what you are trying to do that you think squeezing the last 50 Mbps out of wi-fi is going to help.
Do some research out on the web. Google is your friend. Don't forget, Madison Avenue type advertising has very few gurantees. There are some good reviews and discussions here: https://www.smallnetbuilder.com/.
Good luck.
Model: R7000P|Nighthawk AC2300 Smart WiFi Dual Band Gigabit Router
