using the 417 firmware pack and the Allwinner tool. If your projector is bricked or has the HDMI tearing bug from the May update, this is usually the fix.
Based on user reports from the top forums (Reddit r/budgetprojectors and 4PDA), here is what happens after a successful flash of the "417" build:
) containing the necessary software tools and drivers to flash or "unbrick" the device. 1. Core Hardware Context is an upgraded version of the HY300, featuring 1080p native resolution