This document will explain how to upgrade a 590+ Frame 1 or Frame 2 to version 5.x or 7.x to version 8.x. control board, and migrating the configuration. This is not a firmware update for an existing control board. This is an entire replacement of the control board to upgrade to a modern revision. To update to newer major revisions of firmware, you must replace the control board.
Example: v7.1 can update to v7.2 without replacing the control board. However, you must replace the control board if you wish to go from 7.1 to v8.1