Help T-Mobile Update FAILED

[Bittsen]

I received a notification that my T-Mobile update is ready for download. CLicked OK for it to download.
Went to install it and it says the phone will reboot.
Phone reboots.

I get the screen that I used to root my phone with various selections, one of which is to open a downloaded zip file, etc...

I believe I used Super User (SuperSU in the apps). Yes, I rooted the phone successfully.

I did't want to randomly select something that would brick my phone so I select to reboot.

When the phone reboots I get a message that the update failed. (yes the phone is fully charged)

How do I get the update to work?

Thanks

 

[Deleted User]

official updates wont install if you have rooted your phone

 

[Bittsen]

official updates wont install if you have rooted your phone

Good to know. Would have been better to know before I rooted it.

So, how to undo the root so I can download official updates?