Nova Wolf was there a problem with the router before you updated the firmware? if so what was the issue . If not why did you update it. Did you reset the router after doing the firmware update? This troubleshooting wiki may help
[[Verizon M1424WR Troubleshooting]]
It kinda sounds like a factory reset is in order. Use the reset button on the back of the router and in doing so you will need to reset passwords and user names
Hope this helps