Imac dfu mode how to

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Level 1

30 points

Imac dfu mode how to

How do i put a firmware locked imac into dfu mode. i just bought a new board and it was locked i want to try and save the board and get it working. its a 27inch 2017 imac

Posted on Jan 23, 2026 9:04 AM

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Answer 1

Top-ranking reply

KiltedTim

Level 10

226,308 points

Jan 23, 2026 9:26 AM in response to Duder967

You don't.

There is no way to bypass the firmware passcode. If you bought a used logic board that's firmware locked, return it and get your money back. There is a very real possibility it came from a stolen machine. Even if that's not the case, it's useless.

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Answer 2

HWTech

Level 9

69,530 points

Jan 23, 2026 11:32 AM in response to Duder967

FYI, only the iMac Pro (2017) model has a DFU Mode because it had a T2 security chip, otherwise the only other Intel iMacs with a T2 security chip & DFU Mode were the 2020 models....of course all current M-series Macs have a security enclave chip & DFU Mode.

The vanilla iMac (2017) models had no DFU Mode....same with the 2019 iMacs as well.

When you get the replacement MLB, make sure to try & Option Boot it to make sure it also is not firmware locked.

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Answer 3

Duder967 Author

Level 1

30 points

Jan 23, 2026 10:55 AM in response to KiltedTim

thanks. ya the seller already agreed to send me a new board and he said to scrap the locked one. I just wanted to see if there was any way to save it. oh well.

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