how can i fix my root?

[AC Question]

it says your device didn't start up succesfully. Use the software repair assistant on computer to repair your device. connect your device to your computer to get the software repair assistant.
a problem is that sometimes it doesn't says my phone is connected to

HELP!!!

i downloaded the flash succesfully but when i installed the root(SuperSu) i had an error for the whole night. now i'm stuck with an broke phone plz help so fast as possible.and talk simple english i'm not rly good in english.
plz.also plz tell how can i make it as before i did the root

 

[Rukbat]

It depends on the make and model of phone, but you need the ROM flashing software and the correct ROM for that model phone. You'll have to reflash it to an unrooted phone (and lose all your data).