I just tried using the stock recovery. Restocked, and went straight to recovery. No motochopper or anything.
Still shows the error droid and under the limited option'd "Android system recovery <3e>", it says, in yellow,
"# Manual Mode #"
"-- Applying Multi-CSC..."
"Applied the CSC-code : ATT"
"Successfully applied multi-CSC."
I'm guessing I broke something somehow...but I REALLY hope this is fixable. This recovery lets me reboot system, apply update from ADB, apply update from external storage, wipe data/factory reset, wipe cache partition, and apply update from cache.