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SU app and binarys gets installed to /system/* directory's, The insecure boot.img gets installed to be able to access root adb shell and install those binarys
The root-boot boot.img is temporarily booted once during this process on the first boot of installation, it does not flash the boot.img
The previous boot.img before the installation is restored after SU is installed
Grab the proper file for your version of Android from the link below.
Via XDA