Within the BIOS update folder (usually in C:\DRIVERS\FLASH\... ), look for the default logo file (e.g., LOGO.BMP or similar). Replace it with your new "patched" 120x120 logo, ensuring you keep the exact same filename.
Here is the technical specification that makes "120x120" so critical:
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as an Administrator. The utility will detect the custom image and display a prompt: lenovo oem logo bmp 120x120 patched
For Lenovo devices, the "patched" custom boot logo is typically a 120x120 pixel 16-color BMP file
The real villain is and BIOS digital signing . Lenovo’s BIOS updaters ( WinFlash64.exe or the $0A82000.fl1 files) contain cryptographic signatures. If you attempt to swap the OEM logo using a hex editor without resigning the file, the BIOS flasher will reject the update with an error like:
Which are you currently using to perform this process? Within the BIOS update folder (usually in C:\DRIVERS\FLASH\
Disclaimer: Modifying BIOS files carries risk. Only use patched tools from reputable open-source repositories. We do not host or distribute copyrighted BIOS files.
✅ Original OEM logo extracted (Lenovo_original.bmp) ✅ Custom 120x120 BMP validated ✅ Logo replaced at offset 0x1A4F00 ✅ CRC16 & OEM checksum recalculated ✅ Patched BIOS saved as lenovo_patched.bin
To understand the quest for a patched solution, you must first understand the root of the limitation. Between the late 2000s and mid-2010s, Lenovo (like many OEMs—Dell, HP, Acer) used a specific UEFI/BIOS implementation that stored the boot logo in a dedicated firmware volume. The constraints were brutal: Here is the technical specification that makes "120x120"
of the laptop's built-in screen resolution. For a standard 1080p screen, a 120x120 pixel logo is well within the 768x432 limit. File Size: Total file size must typically be under . Older systems may have even tighter limits, such as for compressed versions.
To create a compatible logo, use an advanced image editor like GIMP or Photoshop: Crop your image to exactly .