Unable to update my system due to signing key errors

so go open again /etc/pacman.conf
and edit this line:
SigLevel = Required DatabaseOptional
to look like this:
SigLevel = Optional TrustAll
then run these:
sudo rm -f /var/lib/pacman/sync/*
sudo pacman-mirrors --continent
sudo pacman-mirrors --api --protocol https
sudo pacman -Scc
sudo pacman -Syyu

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