Samsung held an Oreo Beta program for those who signed up to test non-final firmware builds of the Samsung Galaxy S8 and S8+. The program has since closed and testers are waiting for Samsung to finally drop the final stable release of Oreo for the Samsung duo. As we patiently wait for a stable build to arrive, T-Mobile's software update tracker has been updated to reflect that the Galaxy S8 and S8+ are in the testing stage needed before the mobile carrier can release the update to the masses. This stage could take anywhere between a couple of weeks and a couple of months or...
Source: https://www.gsmarena.com/tmobile_in_testing_phase_of_android_oreo_update_for_galaxy_s8-news-29431.php
