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Answer to: I'd like to reinstall firmwarethere is no EFI update for my model, which is macbook 6.1 :((((((((( shame to apple, since my device was produced apple haven't updated the EFI !
Answer to: Will not fully boottry to reset it using fn+control+shift+power button . press all simultaneously, when system start butting press alt/option too while holding those buttons, this should turn it of. after what push the power button to turn it on. after system full butting, turn it off and do SMC