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The best way to update any phone is to wait for the official release of the OS from the brand itself.
Samsung has promised the Android N update for Galaxy C7 Pro and Galaxy C9 Pro both so its better to wait for the official update to roll out.
However most of the time you will receive the update notification automatically but you can check it through this process manually:
To check the new update you can follow this process:
Go to "Settings"
Scroll down to "System Updates"
Then click on the Check update manually
and then let it complete the process
The second way is to root the phone and install android N based custom ROM in it.
Here is the video showing Step by Step process that how to update the Phone to Android N:
You can find the specs here: Samsung Galaxy C9 Pro
No, the Samsung Galaxy C9 Pro does not have an in-built screen recorder and it is quite obvious as the device is quite old now and this feature generally comes with phones nowadays.
Check Full Device Specifications Samsung Galaxy C9 Pro
To insert sim card in Samsung C9 Pro follow the steps below-