reset admin password

Hi,

I lost my supper admin password. I tried to reset it in maintainer mode, but unfortunately, it did not work.

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Resetting-a-lost-admin-password/ta-p/197045

my fw version 7.4.5, model 60E.

Kindly let me know if I can take a backup, modify on the XML file by removing password from it, or modify on the config file by fortivonverter tool, and import it again to the fw.

any advice pls.