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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.
All your customer needed to do was call Apple and get it re-set. Why didn’t you tell him to do that?
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.
this sort or repair comes with its risks. first of all there is so much heat after two attempts you will need to check the resistors and traces. also chck cont between testpads to the chip. this is normal if you know what you are doing. I think you fried something
