: Indicates this is the fourth segment of a multi-part RAR archive. You need all previous parts (part1, part2, etc.) to successfully extract the contents.

: Likely a project or release identifier, possibly referencing a specific hardware generation or a release date (e.g., December 22, 2022).

: Often refers to "Embedded Linux Architecture" or a specific "Electronic License Agreement" localized for a certain region or hardware set.