Lenovo BIOS archive for the IQ1X0MS motherboard, with U4 and U27 in the name, likely the reference designators of two flash chips. That suggests the 7.4 MB RAR holds separate dumps for each location, so match every image to the correct chip. Use the board silkscreen to find U4 and U27, read and store their current contents with a programmer, then compare sizes before writing. The board revision is not stated, so also check the PCB markings against any other IQ1X0MS files you have.
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 @biosarchive. 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 →