Do a BIOS recovery using the jumper. You’ll have to go to download the recovery BIOS from Intel.
Edit: didn’t read the full post. You can turn off the other LED in the bios.Youll need a display to know what’s going on and to debug. If no storage is present, it usually boots to PXE boot or a screen that says no boot device found.
It’s a rebranded Asus NUC (Intel NUC) with a custom chassis. I doubt they have any long term contracts with the low volume that they sell.