Upgrading 64-bit NanoBSD 2.3 to 2.4

[AndersG]

So, in order to upgrade our appliance, I need to fix NanoBSD? What is the best option? To follow the procedure in:
https://doc.pfsense.org/index.php/Upgrading_64-bit_NanoBSD_2.3_to_2.4

or to backup settings, do a complete fresh install and restore settings?

What is easiest/best/safest?

[dotdash]

IMO, the easiest and safest way to do this is to backup the config, do a fresh install, and restore.

[AndersG]

OK. This is an appliance, VK-T 40 E2. So I guess I just have to follow this:
https://www.netgate.com/docs/pfsense/vk-t40e/reinstall-pfsense.html

And dig out a serial cable.

[dotdash]

That's just an APU1, right? I'd recommend putting an msata in it, and doing a full install.