As we all know, carrier-based smartphones usually get updates a bit slow compared to available devices. A few weeks back, the regular Galaxy S21 Series has secured May 2021 2021 Security patch updates. And now, the T-Mobile Locked Galaxy S21 Series has started getting the May 2021 Security Patch update. The firmware weighs a hefty 1.6GB in size, and it can be identified on the build version G991USQU3ADD.
