[Boulder]

I ran into an interesting problem while trying to revert my HP Chromebox back to the original state to then just install a basic LibreELEC setup on it with the script. I know that I could do it without going back to the very beginning but I wanted to test it as I'm selling my other CB soon, and I plan to sell it in its original state.

The box had the latest UEFI firmware version and Win10 installed. I proceeded by restoring the stock firmware which went fine. Then I rebooted to recover ChromeOS, but an error message appears:

"The connected power supply does not have enough power to run this device. Blahblahblah.."

Well, the box has worked fine with the original HP 19,5V/3,33A/65W power supply on Win10 and also had no issues when it ran Chrome OS while I upgraded the firmware with the script.

Is there anything that I could do but buy a new power supply?

 that's a generic error generated by the firmware when it can't validate that a genuine HP power supply is being used (something only the HP box does).  What backup did you restore -- a backup generated by the script when you flashed the UEFI firmware originally, or one provided by the script at the time of restore? 

That's an interesting check, it's a surprise a simple Google search didn't bring up any results explaining the issue.

I restored the backup generated by the script when I flashed the UEFI firmware.