I managed to install the latest BIOS by the recovery method, removing the motherboard jumper, which allowed installation of Windows 7.
Hello CSMR250, I’m sorry to hear you had issues you NUC. I would like to inform you that sometimes is necessary to install a few BIOS versions before updating the system to the latest version available.
I’m glad to know that you were able to resolve this behavior.
Thanks a lot for letting us know.