An archive of repair files. Shared as “TP.ATM30.PB818_android9_4G_512_M90_NHD.zip” — a .zip file, 439 MB.
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 @tvcodeservice. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip