What is a recommended step before flashing the BIOS?

Before flashing the BIOS, connecting the computer to an Uninterruptible Power Supply (UPS) is a recommended step because it helps to prevent power interruptions during the flashing process. A power loss while updating the BIOS can lead to a corrupted BIOS, which may render the motherboard inoperable. The UPS provides a stable power source, ensuring that the flashing process can be completed without interruption, thus preventing potential damage to the system.

Other options, while they may be good practices for general maintenance or preparation, do not directly address the specific risks associated with BIOS flashing. Disconnecting peripherals can help reduce the chances of errors, but it is not as critical as ensuring uninterrupted power. Updating software and running a virus scan might improve overall system performance and security, but they do not mitigate the immediate risk of power failure during the BIOS update.