Service archive for the iPhone 6, a 2.16 MB RAR with no further details in the name. Such files normally provide the logic board schematic or boardview, letting a technician trace power rails, find test points and locate parts during board level repair of faults like touch IC failure, no backlight or a short on the main supply. Boardview layouts open in OpenBoardView or comparable tools. Confirm the files correspond to the standard iPhone 6 rather than the Plus model before use.
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 @schematicslaptop. 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.