A repair software package. Shared as “NewKingrootV4.90_C142_B262_xda_release_2016_04_21_105243.apk” — a .apk file, 9.46 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 @esquemaseletricos. Enginerys does not host this file.