: While 120x120 is standard for some legacy systems, modern UEFI systems often support larger images (up to 40% of the screen resolution). Step-by-Step Patching Process
). It should detect the image and ask if you want to apply a custom logo. Open Source Tools Lenovo UEFI Boot Logo Changer
Always have a hardware programmer or a recovery USB drive ready.
: Another utility specifically for customizing Lenovo PC boot screens. Troubleshooting Tips Lenovo UEFI Boot Logo Changer - GitHub
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The patched BIOS corrupted the boot block. Fix:
: Always keep a verifiable backup of your original, unedited BIOS ROM using a physical chip programmer (like a CH341A) before attempting to flash a patched file.
Keep the patched BMP under 10KB to ensure it fits the ROM padding.
Large organizations should consult legal counsel before deploying patched BIOS logos on managed endpoints.
Replace the existing default BMP file with your custom 120x120 patched BMP. Ensure it matches the exact filename required by that specific generation of firmware (e.g., USER.BMP or LOGO.BMP ).
Modifying the BIOS Boot Screen: A Deep Dive into Lenovo OEM Logo Modification
| Parameter | Requirement | | :--- | :--- | | | 120 x 120 pixels (square) | | DPI | 72 (default, but ignored by BIOS) | | Bit Depth | 24-bit (16.7 million colors) OR 8-bit (256 colors) | | Compression | None (uncompressed) | | File Header | Standard BITMAPINFOHEADER (40 bytes) | | Orientation | Bottom-up (default BMP format) | | File Name | Usually LOGO.BMP , Lenovo.bmp , or OEMLOGO.bmp (case-sensitive on some BIOS versions) | | Background | Solid black (#000000) is recommended to blend with POST screen borders |
Implementing a custom startup image requires precise navigation of technical specifications, image formatting rules, and firmware update protocols. Deviating from these requirements can cause display distortion or firmware corruption. Technical Requirements for Lenovo Boot Logos
If you have downloaded or created a "patched" logo, the process to apply it is as follows.
Solution: Short the system board’s CLR_CMOS jumper. If that fails, use a hardware SPI flasher (Raspberry Pi + flashrom) to restore the original BIOS.
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