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I've tried checking:
website.com/admin.php [Shows the board is being upgraded]
website.com/install/index.php?upgrade/run [Just redirects to the install page]
I've googled around but none of the fixes work for me.
I should mentioned I went full blown retard and deleted the following folders before uploading.
I'm not sure if this effected anything other than me losing all attachments and avatars.