/application/config/application.php
/application/config/autoload.php
/application/config/config.php
/application/config/constants.php
/application/config/database.php
/application/config/events.php
/application/config/foreign_chars.php
/application/config/hooks.php
/application/config/migration.php
/application/config/mimes.php
/application/config/smileys.php
/application/config/user_agents.php
Where relevant, update any of the config files above in environment directories.
Update /application/third_party/MX/Loader.php
Update /application/views/errors/cli/error_exception.php
Update /application/views/errors/cli/error_php.php
Update all files in /bonfire/ci3/
Update /bonfire/ci2/core/CodeIgniter.php
/bonfire/ci2/core/Loader.php
Update /bonfire/ci2/database/DB_active_rec.php
Update /bonfire/core/BF_Loader.php
/bonfire/modules/builder/views/files/view_default.php
/bonfire/modules/builder/views/files/view_index.php
/bonfire/modules/users/views/user_meta.php