Lenovo released a proprietary tool for enterprise customers called the or part of the ThinkPad Setup package.

Unlike JPEGs, BMP files are uncompressed. This prevents "artifacting" around the edges of the Lenovo text, ensuring the logo looks crisp against a white or grey background.

: A 120x120 pixel square is the standard size for the Windows "System" properties logo, ensuring the image looks crisp without being stretched. Hardware Efficiency

For UEFI systems, you can also place the BMP at EFI\Lenovo\Boot\Logo.bmp on the EFI System Partition.

Disclaimer: Flashing the BIOS carries inherent risk. Always backup your data and ensure stable power during the update process.