RAR archive for the Samsung Galaxy S10, model G973F, 7.62 MB in size. The name lists only the model, so open it to confirm whether it contains schematics, a layout or service manual pages. For a stacked flagship board like the S10, such documentation is valuable when tracing power rails, finding shorted capacitors and identifying test points on each layer. Extract it with WinRAR or 7-Zip. Check the model code against the device, since the S10e and S10 Plus use different boards from the G973F.
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 @esquematicosdecelulares. 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.