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A .pac firmware file, USB drivers, and a flashing tool like SPD Upgrade Tool or Infinity-Box software. Usage Instructions
Power off your device, hold the (or Volume Up) button, and connect it to the PC via USB. Important Precautions Download File s706C-7731-D2(168)-V1.0.part1.rar
Ensure you have the complete set of .rar files for this version. A .pac firmware file
If you are attempting to repair a device that is boot-looping or "brick" (non-functional), follow these general steps: hold the (or Volume Up) button