An archive of repair files. Shared as “ROOT-A105FN-U3-Android 9 Pie File By (Support.HalabTech.Com).rar” — a .rar file, 8.26 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 @mobile_jump2. 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.
7-ZipWinRARThe Unarchiver (macOS)