> It's around 11pm EDT, and I was attempting to upgrade a PM2 from 3.5
> to 3.7
> During the upgrade process, I received a message indicating an invalid
> opcode
> and the upgrade was aborted. At that point the unit was dead, so I
> rebooted it to no avail.
>
This happened to me. I forgot to download it in binary. I followed
instructions and immediately called Livingston and they fixed the
problem while I was on the phone.
DON'T REBOOT. The box is running on the image in RAM.
Get a good image and reflash.