As the Confluence UI is not usable, the customizations in "custom HTML" need to be removed through the Confluence database directly. Before proceeding, please ensure that you have a full backup of your Confluence database.
Run the following SQL query against your database:
SELECT bandanavalue FROM bandana WHERE bandanakey = 'atlassian.confluence.settings';
You can copy the result into a text editor, and locate <customHtmlSettings>...</customHtmlSettings> tag as it contains the customizations added to Custom HTML.
To reset this, you need to remove the customizations added, and your customHtmlSettings should look like:
(warning) Make sure all the tags are complete and properly enclosed, and you have only removed the added codes.
After that you need to update your Confluence database with the modified settings. To do that you can run the following query
(info) You must copy the whole settings and replace <modified_settings> with.
UPDATE bandana SET bandanavalue = '<modified_settings>' WHERE bandanakey = 'atlassian.confluence.settings';
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