nighthawk ac2100 Did a firmware update last night, router has 2 red lights on and now is dead

1. What actual router do you have? AC2100 is a speed

2. What firmware did you install? 

3. What 2 lights are red? 

If something was corrupted during the firmware update, you could try a factory reset first. 

Push and hold reset for 7-15 seconds while powered on. 

If that doesn't help, you can try recovering 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

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adkmgc wrote:

Did a firmware update last night.  Router now has 2 red lights on,  nothing works. 

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Manuals are always a good place to start.

Visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware.

Look for the model number on the label on the device.

Check the section in the manual Troubleshoot With the LEDs.

You may have done that already. I can't tell from your message.

I mention it because Netgear gave up on supplying paper manuals and CD versions some years ago and people sometimes miss the downloads.