Found very interesting post regarding bug in commonly used CI driver (dvb_ca_en50221.c) which lead to many CAM incompatibility!
Posts by HiHat
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Yes, It's legacy CI CAM which not initialized by Formuler drivers

Current OpenATV has CI legacy protocol setting; however, not initializing it too. -
Kindly ask you to fix Formuler F1 CI driver (4.10.6)!
It didn't initializes properly MPEG-4 DRE Crypt NKE/CASv.3 DRE-3 CAM (always "init module" status in Common interface menu instead of CAM name).
This CAM properly initialized and working in my VU+ Solo2 box with old firmware (BH 2.1.6 with 3.13.5 kernel); however, ever not initialized on any Formuler F1 image (from factory 2014 to any current OpenATV/OpenPLI/OpenBH/OpenSPA etc.)!