This is step-by-step guide for XigmaNAS embedded upgrade using a virtual machine.

By following this guide, you can prepare a new bootable USB stick with already restored XigmaNAS configuration. Such a USB stick can be useful when replacing an old, worn-out one, or when moving between major FreeBSD versions, for example, from 11th to 12th. The new bootable USB stick allows you to upgrade with minimal server downtime, reducing the entire procedure to a simple replacement of sticks in a USB socket.

Part 1 contains some useful information that you need to get ready.
Part 2 describes the sequence of steps to create XigmaNAS embedded stick with default server settings.
Part 3 introduces additional steps to get XigmaNAS embedded stick with actual server configuration.