A firmware image contains drivers for the specific LCD/LED panel attached to the TV. Flashing a firmware meant for a 43-inch panel onto a 55-inch TV can result in a "backlight" error or a broken display image, even if the motherboard hardware is the same.
MStar (now a part of MediaTek) is the powerhouse behind the motherboards in millions of Android TVs from brands like TCL, Sharp, and Hisense. Because these boards are so common, a robust ecosystem of community and professional firmware tools exists for everything from basic updates to deep system "hacking."
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