SM7250 processor schematic in PDF format, 1.37 MB, with no handset model or revision named. A PDF reader is all that is needed to search it for net names and pin functions. Technicians rely on these pages to check CPU supply rails, memory and storage interfaces, and clock and reset signals when a phone is stuck dead or in a boot loop. Because the source device is not identified, verify that the layout and part numbering agree with your board before relying on values.
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 @mischematic. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.