Certainly a frequently asked question, and rest assured, we tried to make it happen!
Unfortunately, while the units may appear similar at first glance, upgrading from one version to another is not feasible due to significant updates on the main motherboard (new layout to allow for decoding) and licensing requirements. We would essentially need to remove most of the boards to carry out that upgrade, making it financially comparable to purchasing a new Flex at this stage. :-(
The answer to the possibility to upgrade a unit is unfortunately no.