I have a Watchguard Firebox x10e and i can not log into it

To recover your Firebox X Edge e-Series device, you must first reset the Edge to its factory default settings, and then FTP the Edge v10.x appliance software to the Edge.
To set the Firebox X Edge e-Series to the factory default settings:

1. Disconnect the power supply.
2. Hold down the Reset button on the rear side of the Edge.
3. Connect the power supply while you continue to hold down the Reset button.
4. Continue to hold down the button until the yellow Attn light stays on. This shows you that the Edge was successfully restored to the factory default settings.
   This process can take 45 seconds or more.

1. Copy the Edge v10 upgrade file (yakfw.sysa-dl) to the root of your C: drive.
2. Edit the network settings on your computer so that it is part of the 192.168.111.0/24 subnet.
3. Connect your computer to any of the LAN interfaces on the Edge.
4. Open a command prompt.
   To open a command prompt, select Start > Run. Type cmd and press Enter.
5. Type ftp 192.168.111.1 and press Enter. When prompted, enter the user name admin and the password admin. Press Enter.
6. Type bin. Press Enter.
7. Type put yakfw.sysa-dl. Press Enter.
8. Type bye. Press Enter.
9. Type exit. Press Enter.
   The command prompt window closes.
10. Power cycle the Edge.

What I would suggest you do in this case is to perform a master reset by pressing and holding the RESET button on the back of the box for about 5-10 seconds. Release, wait until it boots, then attempt another login. If you don't have the original manual, as the settings will all be reset to factory, you can download them online from Watchguard.

I hope this helps! Let me know if you need any further assistance in this matter. :) -Jason