This article provides relevant information to keep in mind when changing the next boot partition via CLI (command-line interface).
Changing the partition that is going to boot next can be done on the web UI (user interface) via Configuration > System > Maintenance, on the Firmware Update tab. There is a button that grants the ability to change the boot partition to whichever is not currently set to be booted next.
If unable to perform this through the web UI, this behavior can also be invoked through the CLI by using the following commands:
image boot location [1 | 2]
The numbers (1 or 2) correspond to partition 1 or partition 2. The
boot command will show the partition that is set to boot next.