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Apple A1398 820-3787-a

Can anybody help me? How could I do to put a valid serial in the firmware? I run the ASD, and it shows that the Serial is invalid, so the macbook gets very slow. (Board 820-3787-a).

In ASD the Macbook is being misidentified as Retina 13 ", but it is a Retina 15" 2014
 

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Can anybody help me? How could I do to put a valid serial in the firmware? I run the ASD, and it shows that the Serial is invalid, so the macbook gets very slow. (Board 820-3787-a).

In ASD the Macbook is being misidentified as Retina 13 ", but it is a Retina 15" 2014

send me your dump bios and sn you want inside i help
 

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