iMac efi


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7 years 11 months ago #3056 by
Hey guys just wondering if anyone knows how the dump would be done on the 4K and 5k iMac models...as in are the efi chips soic 8 clip compatible or do the motherboards have the header for the easy flash connector...or none of the above!?! Lol

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7 years 11 months ago #3057 by thaGH05T
Replied by thaGH05T on topic iMac efi
I imagine it has the debug port, but I am not absolutely sure.

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7 years 11 months ago - 7 years 9 months ago #3061 by CygnusX1
Replied by CygnusX1 on topic iMac efi

fast.flow wrote: Hey guys just wondering if anyone knows how the dump would be done on the 4K and 5k iMac models...as in are the efi chips soic 8 clip compatible or do the motherboards have the header for the easy flash connector...or none of the above!?! Lol


What is the model number?

If I helped you buy me a latte!
Last edit: 7 years 9 months ago by CygnusX1.

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7 years 11 months ago #3063 by
I don't have one in particular Cygnus, was just wondering if it was a 'known' on the newer iMacs or if anyone had any dealings with a new model...just me being curious lol

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7 years 11 months ago #3064 by Bigwezel
Replied by Bigwezel on topic iMac efi
i unlocked already a few iMac 5k and 4k models and i can tell you that there is no header and its a bga chip so no soic 8 clip compatible. We have to solder on that model...

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7 years 11 months ago #3065 by thaGH05T
Replied by thaGH05T on topic iMac efi
You are saying there is no debug port?? Can someone produce high res pics of the board front and back??

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7 years 11 months ago #3079 by
That'll be bad news for many of us...removing, reading and replacing a BGA chip is a bit beyond what I'd be comfortable with!! Shame if they've not got a service/debug port :(

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7 years 11 months ago #3081 by Bigwezel
Replied by Bigwezel on topic iMac efi
I can confirm it has no debug port. The only method is to solder to read and write the chip.

When i get one to unlock i'll post high res pictures from front and back side.

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7 years 11 months ago #3089 by thaGH05T

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7 years 11 months ago #3102 by ggltech
Replied by ggltech on topic iMac efi
is that not it...just a different size ?


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7 years 11 months ago #3116 by thaGH05T
Replied by thaGH05T on topic iMac efi
I was looking at it, but that's the receiving end, and I am willing to bet it connects to something. like thunderbolt peripherals., but I have not looked at a board like this.

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7 years 11 months ago - 7 years 11 months ago #3120 by thedude75
Replied by thedude75 on topic iMac efi
no this one is the mic connection
Last edit: 7 years 11 months ago by thedude75.

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7 years 10 months ago #3136 by Bigwezel
Replied by Bigwezel on topic iMac efi
that connection is for the sound i/o board. This includes also the mic.

I will upload high res pictures later for chip locations.

I can confirm that the 5k Late 2014 model still have a normal chip which can connect to with soic 8 clip.

The late 2015 models use same chip as on 2015's macbook's.

There is on both machine's no debug port.

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7 years 10 months ago #3137 by Bigwezel
Replied by Bigwezel on topic iMac efi
location chip for 5k late 2014 models
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7 years 10 months ago - 7 years 10 months ago #3138 by Bigwezel
Replied by Bigwezel on topic iMac efi
chip location 5k iMac late 2015, it is new style efi bga.
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Last edit: 7 years 10 months ago by Bigwezel.
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7 years 10 months ago #3139 by
Dam BGA type chips!!! That's me, my soic clip and interface connector left on the side lines lol... Removing and soldering wires to a BGA type chip is beyond me :(

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7 years 10 months ago - 7 years 10 months ago #3140 by
Would need something like a 2 way soic clip...as you can just see the pads where the connections are made, maybe a clip that grips the top and bottom of the chip to keep the clip in place, then the secondary clip that slides pins just under/onto the pads for connection (if you know what I mean)...so if anyone's able to knock something like that up, job done :lol:
Last edit: 7 years 10 months ago by .

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7 years 10 months ago #3145 by thaGH05T
Replied by thaGH05T on topic iMac efi
It is a QFN fast.flow, but still sucks. i think there have to be a group of pads or a port that connects to it because apple has to do ISP and tests. If for some odd reason there is not I can assume that we could look for an alternate custom solution with a 3d printed clip.

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7 years 10 months ago #3146 by
I like your style ghost, as me near a very expensive motherboard with either an iron or hot air station does not end well haha

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7 years 10 months ago #3147 by ggltech
Replied by ggltech on topic iMac efi

thaGH05T wrote: It is a QFN fast.flow, but still sucks. i think there have to be a group of pads or a port that connects to it because apple has to do ISP and tests. If for some odd reason there is not I can assume that we could look for an alternate custom solution with a 3d printed clip.


They are not to bad to solder..but i don't see any available for purchase preprogrammed on ebay.

The picture attached shows a 2015 model with a SOP 8-Pin BIOS but think they have changed it to a 8 pin QFN...if you look above it programming port solder pads with missing port. ?
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