We had endless Topics, how to do the update the right way.
Why you didnt used the search function?
But you marked the Topic as Solved 
1.Fresh start
2.Log out
3.crtl+alt+f3 to open TTY
4.sudo pacman-mirrors --fasttrack
5.sudo systemctl stop sddm
6.sudo pacman -Syu
and spammed Y to replace everything
7.reboot
Its possible that you run now into a regression, when you had 4 month no update but Manjaro is a rolling release.