I have extracted my theme via File Manager but it somehow crashed. I activated the theme and now I can not access my admin at /my-web/wp-admin/.
Is there another way to change my theme since I cannot access the admin?
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There are a couple things you can do.
Option 1 - FTP
Easiest would be to FTP into your site and change the name of the currently active theme. Your themes are located in
\wp-content\themes\. Temporarily changing the name will disable the theme. This should give you back access to the admin.
Option 2 - Database / PhpMyAdmin
You can also change the theme through the database, mostly likely via PhpMyAdmin.
There are 3 option rows in wp-options that you need to change. Once you change these it will change your theme.
FYI - You can run the following SQL to narrow down just those 3 rows
SELECT * FROM wp_options WHERE option_name = 'template' OR option_name = 'stylesheet' OR option_name = 'current_theme';