ZIP archive of 737 KB labelled A037 (ORG) SUB BOARD, apparently original data for a sub board, or daughterboard. The name does not identify the device, brand or whether it contains a schematic, boardview or firmware, so open it to check the contents. If the archive holds drawings, they help trace connections between the sub board and the main logic board, such as charging port, microphone or antenna lines. Confirm that the markings on the physical sub board match before relying on it.
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 @phoneSchematics. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.