wp-admin not found

How did you perform the downgrade?
Do you see the wp-admin directory when accessing via FTP?

I downloaded wordpress 5.8 and replace all files in the website except wp-content and config.php

Yes I see it, now the dashboard is worked, but when I tried to access any page in the dashboard: some if them appears that page not found, and some pages with errors like:

Fatal error: Uncaught Error: Call to undefined function use_block_editor_for_post() in /home/tegdarco/public_html/wp-admin/post-new.php:71 Stack trace: #0 {main} thrown in /home/tegdarco/public_html/wp-admin/post-new.php on line 71

There has been a critical error on this website. Please check your site admin email inbox for instructions.

When I open most of pages in the dashboard like: https://website.com/wp-admin/theme-editor.php or https://website.com/wp-admin/admin.php?page= it shows that page not found.

The message in the error message is probably caused by a plugin that expects a more recent WordPress version. You would also have to restore the plugin directory to the previous state to solve this.

It would be easier to make a complete backup from before the update.

Sorry but I changed plugins file name to deactivate all plugins and that did not solve the issue.

Is a plugin affects on all pages in the admin dashboard? because I have the issue in many pages in admin dashboard.

To update you, it auto upgraded again to wordpress 6.1.1 and for now wp-admin dashboard not found again!!! what is wrong with wordpress 6.1.1? how to solve this issue?

Any reply? I still have the issue ??

I re-downgrade wordpress and still have the issue, Is this problem in the new version is resolved? so I can upgraded to the latest version without any issue?