An archive of repair files. Shared as “ENG MODEM A305FDDU5ATE1_By@Gsm_Turk_Team.zip” — a .zip file, 18.3 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