Back in April, T-Mobile temporarily put on hold the roll out of a Galaxy S9/S9+ security update over bootloops. Sadly, neither the roll out resumed, nor a new update arrived. However, there's good news for users now: the carrier has started pushing out a new update.
As you can see in the screenshots above, it's a security update that brings along Android fixes for the month of June. The roll out has just begun, so it may take time for the update notification to pop up on your device's screen.
Aside from T-Mobile, there are reports that Sprint and AT&T have also started pushing out the June security patch to Galaxy S9/S9+ units on their network.
how is possible run S9+ on Andrroid 5.0.1 ? Oreo is CRAP! Android P is anoter black-white ugly system without shorcuts for useful opions! After 5.1.1 all options loose practice useful. Why Android must copy hard 5-6 functions click from IOS, ...
In the meantime, Essential already released the June 5 security update for Oreo 8.1 stable, and continues work on the Android P beta.