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Long story short, I have rooted my phone in order to resolve 'low on internal storage' issues (turned out the cache folder grew to almost 2GB). I have used kingoroot as suggested in this answer and it worked nicely.

However, shortly after the rooting, I noticed I had a new lockscreen I've never seen before:

enter image description here

Before the rooting I had what I believe is the official Android lockscreen, where you slide your finger from the center of the screen to a lock icon, camera, or unread messages if you have any.

I certainly don't remember installing a lockscreen app, but after rooting and cleaning the internal storage I finally was able to install updates in Google Play, and there were quite a few of these.

How can I find out where did this lockscreen came from? Is this how Android lockscreen looks now on Android 4.4.2? If not, is it expected to get unwanted software when I root my phone? And finally, how do I uninstall it?

Edit: the method for replacing KingoRoot with SuperSU didn't work. I've got error messages about non-existing files, and SuperSU started but couldn't update the binary.

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    This is certainly bloatware - some possible culprits here – beeshyams Mar 20 '17 at 11:15
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    also see this answer android.stackexchange.com/a/145358/131553 and this comment – beeshyams Mar 20 '17 at 11:18
  • @beeshyams Thanks, this case certainly looks similar to mine. The problem is, I don't see a "DU quick charge" (actually, anything suspicious at all) in my apps list. – Dmitry Grigoryev Mar 20 '17 at 11:35
  • Run the apps mentioned in the linked comment above ( Toaster and Notification history apps) and see if you can track the app – beeshyams Mar 20 '17 at 11:37
  • I was able to do a simple uninstall of kingoroot Superuser using the Apps tool, and then install Super SU using the play store. Root was preserved. – Organic Marble Mar 30 '17 at 16:52

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