Model A1502 / 2.6 GHz (Turbo Boost up to 3.1 GHz) or 2.8 GHz (Turbo Boost up to 3.3 GHz) dual-core Intel Core i7 processor with 4MB shared L3 cache.

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After replacing UEFI BIOS chip does not start the installation.

Hello, I replace the BIOS chip because my client don't remember the EFI password and now with the new BIOS doesn't start the installation. The computer is too low. I put a new installation finished in USB hard disc and start but in a few seconds only appears the Apple logo and don't do anything. I replace with two BIOS and do the same. The apple test appears GOOD. Please help me. Thanks.

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if you got that far, sounds like you just need to do a normal system restore, use the WIFI to download the OS and let it install the latest update on to that imac, but before doing this , you might want to go to disk utilities and ERASE your entire SDD or HDD so it can be a CLEAN fresh install ...

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All your customer needed to do was call Apple and get it re-set. Why didn't you tell him to do that?

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Are you using a Bios chip from another board? If so it won't ever work right you need to find a service that reprograms a new chip with a Clean ME region if you did buy the chip from from a seller and it's running like that it was not properly programmed. You also need to install with clean wiped hard drive otherwise your pairing the EFI lock again.

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hi, what if we tried with new bios chip but imac will not power on, does this mean bios chip is faulty ? also what if the new bios chip is installed with old hard drive cant i get to restore ? or disk utilities without it EFI locking with the same old code .... HELP PLEASE !

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