2.1.2) Uploading the "One Click Backup" via WEBconfig:
Open the configuration of the WLAN Controller in a web browser, go to the menu (Extras) → File Management → Upload Certificate or File and select the option SCEP CA - One click Backup as File Type.
Afterwards select the backup at File Name/Location and enter the Passphrase for the One Click Backup (see step 1.1).