Second part, marked (2), of a K30 PRO set, delivered as a 7z archive of about 1.45 MB; no brand field is given, though the model name matches the Redmi K30 Pro line. The name does not reveal the document type, so extract it with 7-Zip and review the files alongside the companion part (1). At this size the content is likely service documentation such as schematic pages or layout views. Use it to trace rails, locate components and probe test points, checking first that the board revision matches.
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 .7z file
High-ratio compressed archive, often used for large BIOS collections.