It checks the firmware update, starts erasing flash and then errors out.

The touch module is connected directly to the PAB port on the P4.
Nothing else is connected to the P4, not even probes.
No other PAB connected.
I'm connected to the P4 via USB.
I tried the emergency update where you unplug the power and plug back in and that didn't make any difference.
The Touch continues to run on the old firmware.
I had this same problem with the P3 when I tried to update the Touch a few months ago.