XF 2.2 DB Migration

Hello.

we migrated our DB to a new host and upgrade it. Now we're stuck on "The site is currently being upgraded. Please check back later.". When going to the /install it gives 504 Gateway error. I briefly removed install-lock.php and it says the version is "v2.2.6 Patch 2". So its already been updated but it says the update is still being performed. Where can I start to debug this?

Thank you
 
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