Thank you for posting back that your issue is resolved.
Remember that if this situation happens again you can always use the backup created in the process, and simply revert the router back to the old firmware.
Also, when you upgrade your firmware of your router, 99.9% of the time, you will have to do a 'power cycle'.
To do this, do the following:
- Turn off all computers connected to the router.
- Unplug the power cords from the back of the modem and from the back of the router.
- Wait at least five minutes.
- Plug the power cord into the modem and wait at least one minute for it to initialize.
- Plug the power cord into the router and, again, wait at least one minute for it to initialize.
- Power on one computer and try to connect to the Internet with it.
- If the first computer can connect to the Internet, then you can start turning on the other computers, one by one, and checking their Internet connections.