How can I change the SonicWall logo on the firewall login page with my company logo, using base64 encoded image?

SonicWall firewalls provides the flexibility to customize login pages, including chaning the SonicWall logo with a custom company logo. This article explains how to do this step by step using the image data that is encoded with base64. To generate the base64, we are using the Windows PowerShell built-in command set.

1. Go to Manage | Users | Settings | Customization
2. Select "Login Authentication" drop down manu
3. Click on the "Default" button to pre-populate the customizable login page HTML elements.
   
4. We will change the part
5. This is the built-in SonicWall logo in PNG format
6. A custom logo that is 200px to 200px or close to this size would be ideal
7. In this use case our custom logo is saved as "my-logo.png"
8. Let's convert the logo to base64 data with the following PowerShell command set
   
9. The output of this command is redirected to a text based file with the file name "my-logo-base64.txt"
10. You can open up the file with a text editor
11. Prepend "/> to the output
12. If this is done properly and when you click on the "Preview" button, the custom logo should appear. The following screen capture is an example of the login page with custom logo, instead of the default SonicWall logo.