The correct (usually a .bin or .zip file) specific to your hardware version.

If you see "Network Error" or "No Update Available," your unit does not support OTA. You must use Method 2.

Use the 3.5mm jack to bypass the tiny internal speaker.

: Since the standard YG300 doesn't support apps, the best "update" is often plugging in a Roku Express or Amazon Fire TV Stick to the HDMI port.