This patch will attempt to remove two theme settings, "Enable device detection" (enabledevicedetection) and "Device detection regular expressions" (devicedetectregex) Before the patch Check out and install a fresh Moodle instance based on the last weekly release. Go to Site administration -> Appearance -> Theme settings Tick the enabledevicedetection theme setting. Specify the devicedetectregex theme setting with any value. Make sure to fill in both inputs. With a DB editor, run a query on the config table to fetch the records for the 'enabledevicedetection' and 'devicedetectregex' config settings. e.g. SELECT * FROM mdl_config WHERE name IN ( 'enabledevicedetection' , 'devicedetectregex' ) After the patch Check out the latest master branch with the patch applied. Run the upgrade process. Query for the 'enabledevicedetection', 'devicedetectregex' config records again. CONFIRM that 'enabledevicedetection' and 'devicedetectregex' fields have been removed.