Unrooting Note 8 sgh-i467 rooted by saferoot?

Hi all, can anyone help me unroot my Note 8? It was easily rooted with saferoot. I have tried this script in a terminal emulator:
su
# mount -o remount,rw /system
# rm -f /system/etc/install-recovery-2.sh*
# rm -f /system/xbin/selinuxoff*
# find /system/xbin -type l | xargs rm
# rm /system/xbin/busybox
# mount -o remount,ro /system
# exit
$ exit

The line: rm -f /system/etc/install-recovery-2.sh* fails with no such file or directory.
I searched for install-recovery and found it with the name install-recovery.sh. So I changed this line to reflect the correct file name but still get the same error.

I am open to any recommendations on unrooting this device. I would like to upgrade to 4.4.2 or higher.

Thanks, Bob