The file is likely the demonstration video "mcumgr_and_hci.mp4" found within the Nordic Semiconductor DevZone forums.

: Showing how to navigate back to the SMP server application from within an HCI_USB application to facilitate these upgrades.

The video highlights a specific feature: while a Bluetooth HCI_USB program is active. Key technical aspects shown or discussed in relation to this file include:

: Demonstrating how to perform multiple firmware upgrades using the mcumgr tool.

: The board is recognized as a /dev/ttyACM0 device, allowing for image confirmation and board resets.