If a factory reset doesn't work, your software might be fully corrupted. You will need to "force-feed" the TV new firmware via a USB stick.
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Hold the joystick (or Forward/Toward you depending on location). If a factory reset doesn't work, your software
(approximately 2–5 seconds) on the power button selects the highlighted option. Key Recovery Options Wipe Data / Factory Reset (approximately 2–5 seconds) on the power button selects
from the power outlet for at least 30 seconds.
If your TV is stuck on this screen, follow these steps to restore functionality: Try a Basic Reboot : Use the TV remote or the joystick at the back to select [Reboot system now] and press OK. Wipe Cache Partition : If a reboot fails, select [Wipe cache partition]
Press and hold the joystick in the position (do not press it inward/OK, just move it down).