My AC1750 router has stopped displaying any networks

[Toasterwifi]

I decided to change the wifi password on my router, and that was successful, and after that, it told me there was an update available. So I tried to update it, it checked for the update, which was successful, but then was unsuccessful in the installation of it. I tried again a couple of times, but after that, the wifi didn't work and no one could connect to it. And since then I have tried resetting the router, unplugged and replugging it, resetting the modem and everything. I am now using an old router that is insanely slow, please help me.

[plemans]

do wired devices work? 

What firmware were you installing? 

What are all the led's on the router doing (color, blinking, solid, etc)

[Toasterwifi]

I was trying to install a firmware update from the mobile app, wired devices do not work, and the only led is the power led which is blinking blue

[plemans]

You can try recoving it with tftp or nmrpflash.
are you on windows? if so, follow this guide
https://kb.netgear.com/000059634/How-to-upload-firmware-to-a-NETGEAR-router-using-Windows-TFTP
just make sure you enable tftp
https://www.thewindowsclub.com/enable-tftp-windows-10

and here's a video walk through using a tftp client. Use the built in one for windows 10 though. the video is more of an example of how its done.
https://www.youtube.com/watch?v=R9DLrLQrpaw

and if that doesn't work, you can try using nmrpflash
https://github.com/jclehner/nmrpflash