Thanks for reaching out!
I just followed the same guide as you to flash my Joule's BIOS and I'm not able to replicate this behavior. So, my suggestion is that you start over and try to flash your Joule's BIOS again.
Try this and let us know if the error still appears.
I've tried multiple flashing of the BIOS but the message still appears.
We need you to provide us the following information:
When flashing your Joule's BIOS, did you use a USB 3.0 port or a USB 2.0 port?
Were you using the USB cable included with your Joule or did you use a different USB cable?
Have you tried flashing your Joule's BIOS on a different PC? If so, did you notice any difference?
Let us know.
Perhaps try waiting a bit longer? When I re-flash the BIOS, it usually produces an error, and goes on like that for a few minutes before moving on and booting successfully. It doesn't take more than 4 minutes.
This error message should only happen on the first reboot after flashing the BIOS. You should not see this error on subsequent reboots.