An archive of repair files. Shared as “A520F_FIX_DRK_dm_verity_Failed_Android_8_0_0_U12_FRP_OFF_OEM_OFF.zip” — a .zip file, 20.1 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 @Schematic_ir20. 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