Firmware - 3 slots
This morning I just updated the firmware. I only had the option to update to the non-active firmware slot. However, that is my FALLBACK firmware. It is (reasonably) stable and most importantly, known and known to work. I wanted to replace the current version of the firmware, but that was not possible.
Solution: 3 slots required for firmware.
The first, is the "long term stable" version the user can revert to if needed.
The second, the current (or active) service release.
The third, to slot for downloading and running the lastest version that is offered on the website.
I really want to protect that first long-term-stable version and not overwrite it.