The April 2019 security patch was first released for the Galaxy Note 8 in Samsung's expansive smartphone lineup, and it's now being pushed to the Note 8's successor. Samsung has released an update with the latest security patch for the Galaxy Note 9 in Romania, Bulgaria, and Slovakia. The software version accompanying the update is N960FXXS2CSD2 and it's available both over the air and through our firmware database.
It's unclear at this point if the update brings anything other than the security enhancements. The March update for the Galaxy S9 introduced a narrower field of view as the default setting for the selfie camera, a feature that debuted on the Galaxy S10, and we can expect the same change to come to the Galaxy Note 9 as well. Perhaps it will also finally bring a schedule option for One UI's Night mode, which continues to be absent from the Note 9 but was added to the Galaxy S9 with the February update.
You can check if the April update is available for your Galaxy Note 9 by going into the Software update menu of the phone's settings and tapping Download and install. If there's no over-the-air update available for you yet, you can download the latest firmware for the Note 9 from our database here. Do leave a comment and let us know if you see anything substantial in the update other than the new security patch.