I spent hours in the attempt to fix this problem. After combing many posts,
HERE IS THE SOLUTION:
Download KDZ file for MP450N (Currently MP45010c_00_0821.kdz) from:
Download UPPERCUT and LGUP from this post:
Thanks to @autoprime
Install LGUP first, it provides functionality for UPPERCUT.
Make Sure Phone is Powered OFF. Holding Volume Up, Plug phone into Computer Via USB, it will boot into Download mode.
Extract and Run UPPERCUT
Select your phone in UPPERCUT, Set Process to UPGRADE (Refubish gave me an error).
UPPERCUT shows file type as BIN file, click on the file path and hit the [...] button to open the file selector and pick the KDZ file you downloaded (Currently MP45010c_00_0821.kdz).
Hit Start and Wait. Took maybe 2-3 Minutes.
Congratz you now have a factory restored phone.
Be more careful next time.
Maybe actually do a TWRP BackUp before deleting system apps.
You now have to start over with Root and TWRP; but hey, that was the easy part wasnt it?
Many Thanks to all members on the forums working to improve our Android experience.
Thanks @messi2050 , @autoprime