Are you looking to a specific nRF52840 board, or are you trying to figure out what a specific download you found contains? nRF52840 DK - Downloads - nordicsemi.com
: Full hardware support for Bluetooth LE (including Bluetooth 5), Thread, Zigbee, Matter, and proprietary 2.4 GHz protocols. 52840 rar
Custom keyboard firmware (like ZMK or QMK) often used in custom wireless mechanical keyboards utilizing the nRF52840. Are you looking to a specific nRF52840 board,
Open-source router or border router firmware such as OpenThread . 52840 rar
Folders holding customized codebases extracted from the Nordic nRF5 SDK or the RTOS-based Zephyr Project .
Device "sniffer" firmware used to capture and analyze Bluetooth packets in the air. 2. Software Development Kits (SDKs) & Project Code