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The default configuration isn't stored on the device, so it isn't trivial to get it to factory defaults. It's a three-step process. Access the unit, erase the old configuration, and upload the default file.
1. Access the unit without a password:
- Connect a terminal emulator to the console port, set to 9600 baud, N,8,1.
- Power-cycle the unit and hit the ESCAPE key when it starts to boot. You may have to do this a few times at about one-second intervals. The router should come up in bootstrap mode.
- Type bypass passwords and hit ENTER.
- Type boot and hit ENTER.
- Wait for the unit to boot.
- Type enable and hit ENTER. You won't need a password. You're now logged in with the old configuration.
2. Erase the old configuration:
- Type erase startup-config and hit ENTER.
- Answer Y to confirm.
- Type reloadto restart the unit.
- Answer N to saving the configuration.
- The unit will reboot with no configuration.
3. Load the factory default configuration:
- Download the default configuration from https://supportforums.adtran.com/docs/DOC-5917
- Unzip the file and save the resulting text file to your clipboard.
- When the unit boots, type enable and hit ENTER.
- Type config t at the prompt.
- Paste the default text file into the terminal window.
- Type Ctrl-Z to exit the configuration mode.
- Type wr mem to save it to memory.
That's it. You can reboot now, or just start entering your own configuration.
I am going to mark this as correct. Be sure to let us know if you have any more questions.
That is the answer I was looking for! Thanks for the help.