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sed -i "s/mirror.centos.org/vault.centos.org/g" /etc/yum.repos.d/*.repo
sed -i "s/^#.*baseurl=http/baseurl=http/g" /etc/yum.repos.d/*.repo
sed -i "s/^mirrorlist=http/#mirrorlist=http/g" /etc/yum.repos.d/*.repo

Source: https://x.com/usaamahahmed1/status/1819931166394274263?s=46

:w !sudo tee %:w !sudo tee %

Then press L to load content that you wished to save

Source: https://www.cyberciti.biz/faq/vim-vi-text-editor-save-file-without-root-permission