Yesterday I tried to update my production instance and it failed. Everything seemed to be ok until I clicked “Return to main site to complete your update”. After I clicked I was redirected to my main site but it only showed up “Update in process” (white background and just black characters) and nothing happended. I reloaded the browser tab nothing changed the current status. I tried to disable the maintenance mode, no change. I tried to login to the updater.php directly but the login failed because of the wrong password. But I tried it with the correct one. The only solution was to rollback to 13.0.2 by manually copying the backup files and folders.
However, today I tried the update with my testing environment. I updated from 11.0.2 to 12.0.9 and from 12.0.9. to 13.0.4 and the update failed again. This time the redirecting from the updater site to my main site to complete the updating process led me to blank page. Currenty I am trying to rollback to 12.0.9.
Are there any bugs in the updating process? Does anyone get the same errors like me?