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Apps sometimes quit unexpectedly on my Android TV and the system crashes to the home screen. How can I fix this?

How do I clean my projector lens?

How do I use a RS232 cable to power on or power off the projector?

How do I use a RS232 cable to control the volume and sound on the projector?

How do I upgrade the firmware with the USB key?

W5700 USB operates at peak efficiency with the latest firmware.

My remote control is not working. What can be done to fix it?

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