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EC is embedded controller, there is 128kbytes of memory inside. My yoga 2 pro cannot turn on, with flashing keyboard backlight. i reflashed main bios winbond chip. laptop still dead. suspect ec bios could be problem. but i dont know how to flash the embedded controller ( BGA chip is IT8586vq)...

how do u read or write the EC bios? its a embedded flash inside the controller. I may have a corrupted EC bios, still finding ways to rewrite the chip. thanks