: Release the Power button. An on-screen progress bar reading "Software Upgrading" or "System Updating" should appear.
If your TV still boots to the home screen, you can check for 2021 or later updates via the menu: 3rt841b firmware 2021
This chassis is built around a system-on-chip and runs Android 9.0. It is notable for being a multi-purpose LED TV driver board that supports both 720p and 1080p Full HD panels. : Release the Power button
The TV will reboot automatically once the progress bar reaches 100%. Do not unplug the TV during this process. ⚠️ Common Use Cases Fixing Boot Loops: 3rt841b firmware 2021