Unplug the power. Press and hold a button on the box (like Power or Reset) while plugging the power back in. Hold until "Updating firmware..." appears on the screen. Completion: The process takes 3–7 minutes. The device will automatically reboot when finished. 3. Method B: RS-232 Serial Upgrade (Recovery)
Upgrading the firmware on your series is essential for maintaining device stability, patching security vulnerabilities, and gaining access to the latest streaming features . As of May 2026, many users are looking for ways to ensure their Sunplus-based receivers remain compatible with modern video formats and apps like YouTube or Netflix. Understanding the Sunplus Box TV1 20- Series Upgrade Firmware Sunplus Box Tv1 20-