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A1708 EMC3164 BIOS 820-00840-A

hi, i have a macbook retina 820-00840-a that i buy in ebay. yesterday i want to install fresh new and a lock apears, i flash the bios with the one in this thread(clear ME) it did not show the disk after this, then i try internet install and ater a few minutes the lock password sows up again. Helpppp
 
hi, i have a macbook retina 820-00840-a that i buy in ebay. yesterday i want to install fresh new and a lock apears, i flash the bios with the one in this thread(clear ME) it did not show the disk after this, then i try internet install and ater a few minutes the lock password sows up again. Helpppp
now is problem password ?
 

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