How to upgrade Note 2 to newer Android and pass SafetyNet / without being flagged

[masterton]

Hi my friend has a Note 2 who has a very old Android version. Some apps can't be installed without upgrading the system.
I downloaded a custom ROM (Resurrection Remix Android 7.1.2 Nougat) and helped him to flash to upgrade.
However some apps limited the functionality or refused to run. I believe it has to do with the fact it is a custom ROM.

How could I solve the problem? It doesn't matter what ROM to upgrade, as long as:
1. it is stable
2. Android 6 or above (he wants permission manager, preferably with Privacy Guard)
3. can pass SafetyNet and any popular ways app use to detect a custom ROM

Thank you.

 

[B. Diddy]

I moved this to the Note 2 Rooting/ROMs forum for more specific traffic.