Android installer for ES File Manager, version 3.2.5.5, a 4.80 MB APK. A file manager is handy on TV boxes and tablets that ship without one. It lets you browse USB drives, copy firmware files, and install other APKs during service work. This is an old release, so it suits older Android versions better than current ones. Sideload it from a USB stick or via ADB. Later builds of this app attracted adware complaints, which is one reason technicians keep an earlier version.
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 @tv_software. Enginerys does not host this file.