Sep 1, 2020

FON-175 POST Mode Recovery (Factory Reset)

 

If you need to do a factory restore on a Fortinet FON-175 (or FON-175i, FON-375, FON-375i) device, they will send you a document that refers to the "Post Mode" in order to do a recovery via post mode. While the document is helpful, I couldn't make the recovery work as it was written. 

In the document, it suggests you use FileZilla FTP Server. For whatever reason, I could not get the phone's built-in ftp client to connect to FileZilla. After much hair-pulling and Googling, I stumbled across another ftp server to use instead of filezilla: CoreFTP Server.

https://www.coreftp.com/server/

The setup is a little wonky, but in a nutshell:

  • Click the SETUP button at the top.
  • Click NEW in the "Domains" section
  • Type the IP you chose for your IPv4 (192.168.10.x)
  • Set the Base Directory to the folder where you stored your firmware
  • Click OK
  • Select your new domain
  • Click NEW in the "User" section
  • Enter a username
  • Enter a password
  • Set the HOME DIRECTORY to the location of the firmware file
  • Check the "Always Allow Login" option
  • Click OK
  • Click OK to exit SETUP
  • Click the "View Activity" option

Once you have done that, follow the steps outlined in the Post Mode document.

By the way, there is a version of the document online here (though in a foreign language):

https://startcom123.wordpress.com/2015/02/04/troubleshoot-ip-phone-fanvil-post-mode/

*Note: even though this method allowed me to update my phone, the phone itself was still bricked. It kept rebooting after getting to the user screen. At least it was worth a shot.


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