[URL]  Ed, I still believe it still exists.  Go to the link above.   Right hand side of the page toward the bottom, you will see ESN Firmware Compatibility Chart.
Hi All,    There used to be an excellent ESN Support Matrix on the CCA5 pages (copy attached) but since CCA5 has been replaced by Solve Engine, the CCA5 site has been discontinued.   Does anybody know where this Matrix is located/uploaded to now? Thanks Hans
ESN Support Matrix