[Resolved] 3.5 Update Maintenance Mode Doesn't Go Away

Try:
– switching to the Twenty Twelve theme by renaming your current theme’s folder inside wp-content/themes and adding “-old” to the end of the folder name using FTP or whatever file management application your host provides.

– resetting the plugins folder by FTP or phpMyAdmin.

– re-uploading all files & folders – except the wp-content folder – from a fresh download of WordPress. Make sure that you delete the old copies of files & folder before uploading the new ones.

– running the upgrade manually via wp-admin/upgrade.php

https://www.zachgraeve.com/2012/01/03/wordpress-stuck-briefly-unavailable-for-scheduled-maintenance-check-back-in-a-minute/

I found this online, can I try this? Or will I do more harm then good to my website by doing this?