Why am I getting the error Unfortunately Process com.android.systemui has stopped after a system update?

I have a GT-I9195 GS4 Mini working (or was working) on TMobile network just fine. After I got notification of software update, I went ahead and did the process and just after all seemed completed there was a Message Saying "Update Sucessfully Completed" with an OK button; this window never went away it just stayed there. A few seconds after that, another window with the Error message (Unfortunately Process com.android.systemui has stopped) started appearing over and over, it does not let me do anything (I press OK it just comes on again).
I managed to do a backup and then performed a factory reset, but the error message is still there. I've ran out of options and although I see this message on other posts, it seems to be on different situations.
Please help...my phone is nothing more than a fancy paperweight right now.

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