After doing a system upgrade plasma updated to version 6 and I was encountering a couple of errors and searching online apparently I had to enable in pacman’s config extra-testing. After another system upgrade none of the apps worked so i rebooted my system and now I’m stuck. I’ve already tryied stuff like startx but it just opens 3 random terminals. Any ideas how to fix this?
Not sure what were your initial issues that would have needed packages from extra-testing to resolve.
Also, you cannot upgrade to the testing repos only by enabling one of the testing repos.
You need to enable them both: core-testing and extra-testing.
I’m afraid you may have created a bigger issue now, than the ones you intended to resolve initially.
Ops I guess… Maybe a live usb to edit again pacman configs and a -Syyu are enough?
That would be what I would try.
We should hope that you will get your system to a bootable state so that you could post here about your initial issues and get help from KDE Plasma users on the forum to start troubleshooting.
Edit:
If you want to downgrade your packags, then you need to pass -uu that is: pacman -Syuu
I’ve tryied but I’m getting a ton of errors saying that x file exists in filesystem so none of the packages gets updated
You’ve got a bit of a mess on your hand to resolve. 
In chroot, first of all disable the testing repos in /etc/pacman.conf.
Then run:
pacman -Syuu --overwrite '*'
to get your packages back to their versions in the stable repos.
Ok thanks it worked, now I’ll try fixing plasma’s error, this time without breaking everything 
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Nice! Good luck!
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