Similar issue here, WordPress update installed v5.7 which is NOT Compatible with BBPress v2.6.6. Meaning that I’m going to have to backup to the earlier version, BBPress is compatible up to: WPress v5.6.2
Entire WordPress crashed, where I had to go into hosting cpanel to disable all plugins, see:
https://www.wpbeginner.com/plugins/how-to-deactivate-all-plugins-when-not-able-to-access-wp-admin/
