Per l'unroot ho trovato tre righe su xda postate dall'utente edan1979:
"root usually involved this 3 files... and i give you the location as well
system/xbin/su
system/xbin/busybox
data/app/superuser.apk or data/app/chainfire.supersu.apk (kind of... filenames maybe different)
delete this 3 files while you are still root then turn off your device. switch it on = root no more...."
non ancora testate. Il punto sarebbe per me togliere le applicazioni samsung indesiderate e poi unrootare