ThinkPad X1 Yoga 5th Gen BIOS archive for machine type 20UB, an 8.91 MB RAR from Lenovo. Its size is close to the X1 Carbon 8th Gen 20U9 packages, but the name does not confirm a shared image. No board code or version is stated. Technicians use these dumps to rewrite the SPI flash with an external programmer after a failed update or corruption. Back up the original chip, which stores unit-specific data, and confirm the image matches the chip size.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosfilebins. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →