If I factory reset a firewall

[BusinessUser]

I know I will lose the config.

But will it lose the firmware in which it was recently upgraded?

[Dan_Eng52 · Accepted solution]

Hi there, 

Take a look at this post within the knowledge base:

Technical Tip: How to reset a FortiGate with the d... - Fortinet Community

To answer your question, it will clear all changes made to the FortiGate configuration and resets the system to its original configuration with the default factory settings. It does not change the firmware version or the antivirus or IPS attack definitions.

Regards, 

Dan. 

[sw2090]

no you will not lose the firmware. 

Exec factory reset (or pressing the reset button if one exists) just will delete your config und put the device back to factory config.

The only way to lose the firmware is to use a serial console to enter the bootloader menu during bootup and have your boot device formatted.