Firmware upgrade - slot used

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?

The upgrade happens to the copy of the firmware that is NOT currently in use.

FYI. You can play tricks with this discussed here

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Thanks @Michael, very helpful answer & blog post.

Peplink, perhaps you could consider updating the corresponding KB (at Upgrading Firmware - The Manual Method) to make this clear. Also, perhaps the UI can advise the user which firmware is about to be upgraded as part of the upgrade confirmation prompt.

Article updated, do you think this is clear/helpful?

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@Travis, yes! Thanks for the quick processing.