Macbook Air A1534 Read Dump but not write


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2 years 8 months ago #5011 by Ghost3DO
After reading forum , and service manual from motherboard Air A1534 i trace Pinout to my programer. I can read full dump but no write.
Im using cheap programer CH341. When i try to erase or write i have "The chip and contents are in disagreement."
I have select windbon W25Q64BV but if i try to audetect chip type. Programer detect MXIC - MX25L6405D but cannot write.
I don´t have desoldering BGA i try to program via pads pin out.
Any suggestion or int to point me to problem.
Thanks
best regards

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2 years 8 months ago #5016 by .::iRizwan::.
it's mean that the readed dump or the edited one is not exactly same size as chip internal memory.
it should be exactly same bytes available in EEPROM memory.

.:: One Machine can do the work of 50 ordinary men, No Machine can do the work of 1 extraordinary man ::.
The following user(s) said Thank You: Ghost3DO

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2 years 8 months ago - 2 years 7 months ago #5051 by reverendalc
Yes you can get all sorts of nonsense when applying wrong voltage or excessive speed to chip.

Please ensure your vcc is 3.3v
Last edit: 2 years 7 months ago by reverendalc.

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2 years 8 months ago #5073 by Ghost3DO
Only U8800
64MB-SPI
W25Q64FWBYIG-MX25U6435F
using 1.8V i think this flash is SSD controler. Not EFI CHIP.

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2 years 8 months ago #5077 by mariob
Hello friends, if it is a logic board M 12 "2015 - A1534 820-00045, it has 2 SPI chips, one of 1.8v and another of 3.3v!

The 3.3v is next to the JTAG connector for SPI reading!

The other SPI Chip is close to the battery connector!

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2 years 8 months ago #5078 by reverendalc
Interesting. I've only had a few 12s so far, thus my experience is limited.

I'm now interested to look at schematics again.

Which chip is interfaced via debug header?

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2 years 8 months ago - 2 years 8 months ago #5079 by mariob

reverendalc wrote: Interesting. I've only had a few 12s so far, thus my experience is limited.

I'm now interested to look at schematics again.

Which chip is interfaced via debug header?




Hi friend, it's the U6100 3.3v Chip that is read by the connector!

And the U8800 is 1.8v!

As shown in the schemes below!

Is that in fact the U6100 is BOOTROM!

And the U8800 and SSDROM.







Attachments:
Last edit: 2 years 8 months ago by mariob.
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2 years 8 months ago #5099 by reverendalc
Thank you for the clarification mariob!

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2 years 8 months ago #5168 by camelion
hello i need know the destroyer is good for unlock a1534 or no ????? any one test this

uss

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2 years 8 months ago #5184 by Ghost3DO
What Mac EMC... A1534 have to many variantes motherboard.

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2 years 8 months ago #5195 by camelion
this is mac mini gold A1534 EMC 2746

uss

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2 years 8 months ago - 2 years 8 months ago #5196 by reverendalc
not fully tested at this point but should be considered working on macs with 12pin debug header
Last edit: 2 years 8 months ago by reverendalc.

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2 years 7 months ago #5477 by InDustWeTrust
I´m receiving an emc2756, gold, 1.2Ghz in a couple days. Don't know if code is 4 digits or 6 digits yet.

Do you guys know if the chip that communicates with the port in which the Easy clip version 3 connects (the new one, the white clip) is 3.3V or 1.8V?

Will my typical eBay programmer adjust the voltage, or should I just leave it with power on and remove the power cable to the clip?

Any help would be welcome, I can also post photos if you guys need them. thanks!!

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2 years 5 months ago #6385 by dam1inc
can anyone post clean dump for a1534 emc 2746 please?

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2 years 5 months ago #6386 by camelion
ok send your dump for cleaning

uss

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2 years 5 months ago #6390 by dam1inc
actually im having problems erasing chip and writing back to it and before i start messing with it i wanted to just check to make sure my checksum matched one of a clean one so if u wouldnt mind just posting checksum of a clean if available id appreciate it.
thanks

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2 years 5 months ago #6396 by dam1inc
I know how to use Hex editor to remove password after $SVS, I need checksum from dump to determine if i have read correctly before I erase and attempt to write. thanks

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2 years 5 months ago #6399 by cyber16
imo if you do that, a clean GOOD dump will not have the same checksum, you need to remove the $SVS & the password that follows it.

dam1inc wrote: I know how to use Hex editor to remove password after $SVS, I need checksum from dump to determine if i have read correctly before I erase and attempt to write. thanks

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2 years 5 months ago #6400 by dam1inc
well i read it a bunch of times, and checksum matches, and ive now wrote it a bunch of times and re-read it and compared that file a bunch of times and checksum matches but doesn't boot and from my limited experience is an indication that somethings wrong :P i have the 1.1 core m .

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2 years 5 months ago #6401 by Ghost3DO
My storey... My model have a Macronix. Mini pro not support read or write. Sofi 8 Sofi 16 support read.... Cannot find a state to write. But now is total dead. Destroyer kill The Machine... Possible Macronix. :) New IC for this model, is very expensive for now. So i go to try to change by other Macronix. After test i back :)

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