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The main purpose of using an Uninterruptible Power Supply (UPS) while performing BIOS updates is to prevent data loss during power outages. BIOS updates are critical processes that involve rewriting firmware on the motherboard. If the power were to go out during this process, it could result in a corrupted BIOS, which can lead to a system that will not boot or function correctly. A UPS provides backup power, allowing the process to complete successfully even in case of a power failure, thus protecting the integrity of the system and its data.

In contrast, the options related to improving system performance, enhancing video output quality, or ensuring compatibility with older hardware do not directly relate to the purpose of a UPS during BIOS updates. These aspects focus on different functionalities and concerns in computing, such as upgrades or compatibility issues, rather than the protection against power interruptions during critical system updates.