Usually caused by using a firmware version intended for a different screen revision. Always check your board version (printed on the PCB inside the shell).
Before diving into the custom firmware, let’s establish the baseline. The X12 Plus is typically recognized as a versatile Android-based device, often sold under different brand names. It features respectable hardware for its price point—usually a Rockchip or Allwinner chipset, 4GB of RAM, and 32-64GB of storage. It supports 4K output, dual-band Wi-Fi, and USB peripherals.
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