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Apple Apple BJ43 MLB_051-9800 820-3437 A1466

before where Programming it how ?
i have an experience for example, years ago, have a macbook air a1466 (efi lock), after change the bios, efi lock and icloud gone. but have a same symptons, cannot enter osx. today i got the same problem. but from the start, it cannot enter osx, ssd in good condition. i think should be have a problem in bios. any suggest?
 
hi any one can help me to give me the solution to remove the efi without removing the bios chip from the mac plz
 

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