How do I upgrade on-prem Network Security Manager firmware?

This article provides steps to upgrade firmware on existing On-prem Network Security Manager installation.

It is recommended to first take a backup of the NSM system before upgrade using below KB.
Taking backup of NSM On-Premise before upgrade | SonicWall

Follow below steps when upgrade package (SWI file) is available on MySonicWall. 

1. Login to MySonicWall account and navigate to Resources & Support| Download Center.
   
   
   
2. On the main page, search for NSM and select it to download the file
   
   
   
3. Save the file to your local system
4. Now Login to existing NSM On-Prem Appliance
5. Click on System at the top of the page
   
   
   
6. Once the System page loads up, on the left hand menu, navigate to Settings | Firmware and Settings 
   
   
   
7. It's best practice to first click the Export Settings option to save a backup of the current NSM configuration.
   
   
   
8. Click on Upload Firmware.
   
   
   
9. Browse to the firmware file downloaded in step 3 above then choose the file and click Accept.
   
   
   
10. Click Confirm to continue with the upload of the firmware file.
       
    
    
    
    
11. Once uploaded you will see an updated page with the Current Firmware Version and the Uploaded Firmware Version.  Under Actions, click  the Power Icon on the Uploaded Firmware Version line and this will trigger the firmware upgrade.  Click Confirm when the Warning banner pops up.
    
    
    
    
    
12. Once this is done you have completed the firmware upgrade process.  You should now see the new firmware version listed as the current firmware version and your upgrade is complete.

Note: When upgrading from NSM 2.3.3-5 or 2.3.3-6 to 2.3.4-1, there are two options:

1. Using System Update when SWI file is not available, follow steps in below KB:
https://www.sonicwall.com/support/knowledge-base/how-to-upgrade-on-prem-nsm-via-system-update/220214054538077/ 

2.  Using safemode to upload 2.3.4-1 SWI file. Follow Network Security Manager On-Premises Getting Started Guide to boot to safemode