The official Dell BIOS is locked down. If you searched hoping to unlock hidden features (overclocking, resizable BAR, NVMe boot), you need a modded BIOS .
For systems that support it, a more straightforward method might involve creating a bootable USB drive with the BIOS update: dell mih61r mb 100971 bios upd
The is a micro-ATX motherboard manufactured by Dell, primarily found in the Optiplex 3010 and some Optiplex 7010 desktop models. The "100971" is a common silkscreen number on the PCB (Printed Circuit Board) used for factory identification. The official Dell BIOS is locked down