Update van Joomla 5 naar 6

How can I update from Joomla 5.x to 6.x?
After updating to version 6, I can no longer access the site or the administration area.
Or am I required to purchase a new copy of the same template I’m currently using and then rebuild the entire site?

Hi!
What happend?

We need all Versions of your Extensions, Joomla, AF, Template.

Maybe we can more see with the debug .modus.

forum.joomla.de/thread/6467-fehler-finde...ug-modus-call-stack/

Please activate it.

Maybe helpfuly.

www.joomlaplates.de/template-installatio...joomla-6-update.html

Dont forget the Link to the Website!

I don’t quite understand it, but I’m going to put this issue aside for a while. I’ve started using a new template.
Thanks for the response.