Archive of repair solutions labelled Y6, packed as a 2.47 MB RAR file; no brand is given in the input. Solution packs like this usually contain annotated board images showing jumper routes, voltage points and component locations for common faults such as charging, display, network or audio problems. Extract it with WinRAR or 7-Zip to view the images. Since the name gives no board revision or exact variant, check that the board pictured matches the phone you are repairing before following any jumper or replacing parts.
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 @schematic_mobiles. 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.