If I understand what you are saying, You had the meter running with version 7.3.xx and reloaded the older version 5.5.xx. Now the meter will not run basically, anything.
Is this correct?
Have you tried to uninstall the old version and re-install the version which was in the meter before the problem began?
Sounds like the old version just does not recognize anything, maybe because the old version is not compatible with the new version programs left behind in the meter when the old version "overwrote" the new basic firmware.
Did you completely uninstall the 7.3.xx version and all related programs before installing the 5.3.xx version? Sounds like you did not, based on
Quote: "and then all installed firmware (Adv. Analyze, Route, Balance, Alignment & ODS Modal) become inactive". Unquote:
Unless things have been changed in the "updated version" process from Emerson, when a new version of something is installed, be it software or firmware, most of the newly installed related products will not operate with an older version.
You may have to contact Emerson to straighten this out.
Just my opinion and I may be wrong.