dgarratt wrote:the pi lights all go out as if I had done a shutdown.
This is odd, the red LED must not turn off during shutdown.
well, I have encountered this before.
When you do upgrade use this command
once the upgrade is finished, shutdown the RPi. The red LED MUST remain ON.
The red LED will only turn off once the power from the microUSB port is removed (unplugged, or power from the AC mains of the PSU is cut).