Samsung Galaxy J7 Pro root package, model J730F, built for binary revision U4 running Android 9.0, supplied as a 21 MB tar. Technicians load it in Odin and flash it with the phone in download mode to replace the boot image with a rooted one. Check that the device is on bootloader revision 4 before writing; Samsung rejects mismatched binaries. Enable OEM unlock, back up data, and keep the matching stock firmware, since Knox trips permanently and recovery requires a clean reflash.
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.