I rooted my phone a month ago and downloaded the SuperUser app yesterday.
However, when I use the app SuperSU, it is not running and it said i need to update a file. I could not update it.
What can I do? How can I remove SuperUser?
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Run the SuperSU app. If you’ve uninstalled it for whichever reason, all you need to do is Reinstall it from the Google Play Store.
Click on the Settings tab on the top right corner, and then click Full Unroot. Confirm with 'Continue'.
Once this operation is done, which takes a few minutes, you can reboot your Android.
Uninstall SuperSU.( If Exists.....)
If you already have a custom recovery (ClockworkMod or TWRP) installed then you should be able to flash the Superuser recovery zip which will remove any other binaries/files related to other superuser apps in the process.
The SuperSu app may still be installed but you can un-install that yourself as you would any other app.
Quote from Superuser play store description:
Manual installation with the recovery zip:
Recommended if you are having installation issues or are not rooted http://download.clockworkmod.com/superuser/superuser.zip
If you have installed them as system apps, use any root browser and delete apks from /system/apps, else, delete them from /data/app and then install anything you like from Play Store. Do NOT flash zip or Google Play updates and any apk of that app will not install.
P.S. SuperSU has uninstall option.
How to fix the SuperSU binary file issue (at leat on the MXIII-G player)
Install a terminal app from the playstore and connect so you get the prompt.
Become root and check how the /system partition is mounted as read-only (ro), In particular note the device
$ su # mount | grep system /dev/block/system /system ext4 ro,relatime,barrier=1,data=ordered 0 0
Remount the partiton in read-write mode (rw)
# mount -o rw,remount /dev/block/system /system
Finally check if it was mounted in read-write mode (rw)
# mount | grep system /dev/block/system /system ext4 rw,relatime,barrier=1,data=ordered 0 0
Update the SuperSU via the Play Store and reboot when done.