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wp-admin 404 error after upgrading to 3.5.2

A couple of days ago I upgraded my wordpress from 3.5.1 to 3.5.2. After the upgrade I wasn’t able to log back into the admin page. I just now got it back to working status. I found a post on the wordpress.org forum that helped me out. Thank you ahiddleston.

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– V3.5.2 seemed to update okay but I was kicked out of the dashboard right after it finished patching

– could not get back in

– noticed the 404 URL string was referencing “wp-admin/upgrade.php” could not be found

– copied in a new and fresh upgrade.php file

– WordPress prompted that the DB was out of date and need patching

– DB patched — everything working great again.