Method varies by version; most use a Windows PC and a USB-to-Serial adapter (not USB charging cable).
Do not unplug the power during this process. The projector will usually reboot automatically once finished. 4. Common Troubleshooting yg300 firmware link
Finding firmware for a YG300 device is an exercise in patience, but it is often successful. Your primary strategy should be to use the on-device update function. If that fails, contact the seller for the most reliable, personalized help. Only after those avenues are exhausted should you turn to community forums or verified third-party downloads. Method varies by version; most use a Windows