Archive for the Lenovo IdeaCentre B320 all-in-one PC, packed as a 3.83 MB RAR file. The name names only the model and does not say whether it holds firmware, schematics or other service data, so open it and review what is included. If it contains a BIOS image, a technician would program it onto the board's SPI flash with a hardware programmer to fix boot problems. Always take a backup of the existing chip first, and verify that the board version and flash capacity match what the file expects.
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 @hrtechno. 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.