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Firmware flash Tips: http://www.emaxmodel.com/blog/AmandaChen/   EMAX LIGHTNING 20A ESC:   1. The first BLHeli ESC with Synchronous Rectification hardware design in the market 2. Utilizes high-performance F396 MCU 3. Lightweight: 5.5g including power wires and signal wires / Small Footprint: 24.5*12.5*5.0 (mm) 4...