Hello. I am working on a mobile application based on the example of appeon salesdemo mobileframe.

Currently, I can lock my app in portrait mode, so if I rotate my phone 90 degrees it still remains in portrait mode, but if I flip it over, it goes to reverse portrait.

It is important for me to avoid this, because it is not really a phone, it is an Android based barcode scanner and this rotation prevents me from working properly. I would appreciate any ideas to fix this.
It is not a matter of the device itself, since outside the application it does not rotate in any case.

Thanks in advance.