RAR archive of about 2.29 MB tied to the Samsung SM-A127F, a later variant of the Galaxy A12. The name carries only the model code and gives no details of the contents. Its small size points to documentation such as schematic pages or layout images rather than a complete stock firmware. Open it and review the files before use. The A127F uses a different board from the A125F, so match the model code and the board number on the PCB before taking measurements.
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 @SMART_PHONE_SCHEMATICS. 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.