After upgrading an F200 device or PC server to the newest version of Desigo Optic, users must reupload any custom signed certificates necessary for HTTPS proxy server access. Likewise, when downgrading a Desigo Optic F200 device from version 5.1.8 to an earlier version, users must reload any custom signed certificate(s) for the HTTPS proxy server. This requirement applies to a new or cleared F200 device that had 5.1.8 as the first installation of Desigo Optic.

Otherwise Desigo Optic will automatically use the default self-signed certificates.

The workflow to reload custom signed certificate is available here