OK. I'm stuck (again).
I tried to reload the stock HTC ROM, and now I'm stuck at the HTC black screen with four warning signs in each corner.
I tried the HTC bootloader unlock, but it didn't work.
Oddly, I can get to recovery by using Android Flasher. but the phone won't boot or get back to the bootloader or recovery menus on its own.
Now I see (when I unplug the device) that it's S-On again (after trying to update it with HTC software.
Now I think I'm screwed...
HTC Aria w/ OS 5.0.2 (Key Lime Pie)