Modern Fujitsu devices have "BIOS Recovery" partitions. If a flash fails due to a power cut, many models (2019 and later) can recover automatically by holding Ctrl + Home on boot. Furthermore, the Windows tool verifies the checksum before writing.
The Fujitsu BIOS Update Tool is a utility provided by Fujitsu to update the system BIOS/UEFI firmware on Fujitsu-branded laptops and desktops. It packages firmware images and an updater application (Windows executable or bootable image) to apply fixes, security patches, compatibility improvements, and new hardware/feature support. fujitsu bios update tool
so you clicked on this video chances are that you own a Fujitsu Exo Q55655. Q556/2 a series of mini pieces first released in 2015. Fujitsu Globalhttps://support.ts.fujitsu.com DeskUpdate - Fujitsu Support Modern Fujitsu devices have "BIOS Recovery" partitions
If a new BIOS introduces instability (e.g., fan always on, boot loops), Fujitsu officially permits downgrading only if: The Fujitsu BIOS Update Tool is a utility