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I had the same problem(as lot of people are)
The new superuser would not remember permissions until it was updated, yet it would not update.
So I solved it by:
dragging the older version superuser.apk out of the "One Click Root for SCH-R720" folder,
(from page 1) onto my SD card and installed it.
now all is back to normal
If you saved or find a previous version of superuser.apk it should work.
No.can you download the run.bat on to ur sd card & than run it from your fone? my computer isnt letting me download the samsung usb driverHELPPPPP.
No.
Folks, if you're having trouble, disable your AV, redownload the drivers and the package, READ the instructions fully, and try again. Further problems, try a different MicroUSB cable - the Samsung stock cable is known to suck!
Windows users: all of the above continues to fail for you, replace run.bat with this, and run again: http://goo.gl/oAlVr

you say to disable the av what do you mean please ?![]()

bro don't worry about it, i traded my rooted optimus m to metro and traded it for my admire. Those idiots at metro piece of shit wont notice the difference from a rooted or unrooted phone. Especially since my guy who i talked to was columbian who speaks spanish.
how did you do this?Said Goodbye to "hello--hello--hello
dont worry about it, the ******s in mpcs wont know the difference from a rooted phone to a unrooted phone.