Hi,
I have proceeded to follow the upgrade steps as described here:
https://docs.joomla.org/Joomla_3.x_to_4.x_Step_by_Step_Migration
After perfoming Step 1 of "Going to Joomla! 4.x" - After changing the Error Reporting to Maximum and clicked to save....
...the backend broke, and now gives only error.
https://test.irislichtinger.com
PS Please see my access data on my other posting locked by Saguaros.
