T-Mobile Galaxy S8 and S8 Plus are now receiving the BQK5 firmware build with November security patch and various other system improvements. The update is rolling out over-the-air as we speak, if you haven’t received the update notification yet, head over to device Settings » System updates and check for an update manually from there.
The update comes with firmware build G950USQU2BQK5 for the Galaxy S8 and G955USQU2BQK5 for the Galaxy S8 Plus. This firmware build is rolling out to all US variants of the devices to make them compatible with all networks. With this, you no longer have to flash another carrier’s firmware onto your device to switch carrier. Just insert your new carrier’s SIM and restart the phone to register it on the new network. Pre-installed apps from your previous carrier will also automatically disable when you restart the phone.
This update particularly makes it very easier to bring your Galaxy S8 and S8+ from any US carrier to Sprint. Until now, Sprint would only register a device that’s in their database. But with this new update by Samsung, you can just pop-in your Sprint SIM to any carrier’s (unlocked) Galaxy S8 and you’ll be good to go.