Verizon FiOS → Default Actiontec MI424-WR Rev F password?

(Disclaimer: my market is served by Frontier rather than Verizon, but in this case I don't think it matters.)

I got FiOS installed today I want to set up the DMZ option so that I can manage my network using my router that has Tomato on it (port forwarding, wifi whitelist, etc. etc.).

For the life of me though I cannot manage to get past the log in screen on my modem/router combo that was provided to me. I've tried Firefox 4, Chrome, and IE9 just to make sure it's not a browser issue. Neither admin/password nor admin/password1 worked, so assuming the tech changed my password to something else, I hit the reset button on the back of the device. Still though I cannot log in!

"Login failed, please try again:"

Does anyone have any suggestions? It's probably a stupidly simple solution too...

The password is the serial number (not the MAC address) on the back of the modem.

The one under the barcode? It doesn't seem to work in either uppercase or lowercase. Hmm.

Make sure you're holding the reset button in long enough.
The lights should all go out, then flash rapidly.

I believe that after a hard reset the rev. F should come up and prompt you for a new password.

Try username (lower case): admin
Password: Serial Number on Modem

Also read this thread about password changes by Verizon:
»Router password change?

If you still can't get in, you'll have to call Frontier.

It looks like this was the case. I just quickly pressed the reset button before which made it reboot itself, but this time I held it for a good 15+ seconds before letting go. It rebooted same as before, but now it's prompting me for a password.

Thanks all!

Just to be clear:

User Name: admin (lowercase)

Password: (router's serial number - alpha characters are uppercase)

I tried this multiple times, but maybe I'm just fat fingered.