Fiori client iOS version 1.0.6 certificate error

Dear experts,

I can run the Fiori launchpad well on desktop and mobile browsers either using HTTP or HTTPS.

But got a certificate error using iphone Fiori client.

I've already installed the certificate on the iphone according to the SAP-Fiori_1.1-Client-User-Guide.

I've changed the URL port in "settings" from HTTPS to HTTP but still get the same error.

Also, although I did the above settings, the error log is still related to HTTPS.(cache clean up activated)

Any suggestion would be appreciated.

Thanks,

Chloe