Firmware is low-level software embedded in the projector that manages hardware functions (display, input handling, power management, audio, and system menus). Manufacturers occasionally release firmware updates to fix bugs, improve compatibility, add features, or patch security issues.

Method C — PC tool / serial update (advanced / rare)

What Is a Firmware Update and Why Is It Important - NinjaOne

: Many users report that these budget units rarely receive significant performance updates; if your unit is functioning correctly, it is often safer to avoid manual flashing. YG300 Projector Guide – Apps on Google Play

Most YG300 projectors use Rockchip (RK) or Allwinner chips. The tool you need is (for Allwinner) or AndroidTool (RKDevTool) for Rockchip.

Never interrupt a firmware update. Never use a PC that crashes often. Always verify the MD5 checksum of the downloaded file against the forum post’s checksum.