The most common and reliable method for updating is the "forced recovery" or "emergency update" method using a USB drive. Here’s how to do it, based on information from official sources and user experiences.
Custom firmware voids any remaining support and can permanently brick the device if done incorrectly. Egreat R300 Firmware Download
Some users mistakenly searched for "Egreat R300 firmware" for a smartwatch, but such content is not relevant to the media player. The most common and reliable method for updating