Just in case anybody else tries to do this in relative darkness, I removed my ST-Module from the controller board in order to attach it to my computer via USB port. After successfully flashing it to firmware 6.3 I reattached the module to the controller board and was confronted with all sorts of weirdness including a suddenly absent GPS signal (my onboard GPS has never worked, but the external had worked just fine.) No amount of booting, etc. worked. I even removed the ST-Module again and reattached it...I THOUGHT!
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I finally disassembled the controller board from its case and discovered that I hadn't actually firmly seated the ST-Module on the controller board while working in the relative darkness of my loft last evening!
Voila, a GPS signal is again found. Now if I could only figure out how to easily achieve a proper ground of the controller from the loft.
