During firmware upgrade, which slot is being upgraded? Is it the current slot, the slot running the latest firmware, or something else?
My router looks per the following screenshot. Currently booted to 8.1.0 and has 8.1.1 Beta 1 in the second slot. If I upgrade to 8.1.1 Beta 2 would it overwrite 8.1.0 or 8.1.1 Beta 1?