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A1502 (early2014) 820-3467-A
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8 years 8 months ago - 8 years 8 months ago #848 by VIPER_GE
VIPER_GE
A1502 (early2014) 820-3467-A was created by VIPER_GE
A1502 (early2014) 820-3467-A dumped with CH341A China 24xx/25xx eeprom reader, inside archiv 2 files, original and edited efi info with edited last 4 digit serial number. password is 1234 attachment is bigger here and i upload it to my gdrive some info: Macbook Pro (Retina, 13-inch, Mid 2014) EMC2875, 2.6Ghz/i5/8Gb
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Last edit: 8 years 8 months ago by VIPER_GE.
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8 years 8 months ago #849 by thaGH05T
If I helped you, buy me a beer!!! Happy Hunting...
Replied by thaGH05T on topic A1502 (early2014) 820-3467-A
Thanks for the contribution.
If I helped you, buy me a beer!!! Happy Hunting...
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8 years 8 months ago #852 by drexxx
Replied by drexxx on topic A1502 (early2014) 820-3467-A
Just a quick question, can you use the firmware from the same model number but different EMC
as this one kindly uploaded is a A1502 EMC2875
Retina, 13-inch, Mid 2014 2.6Ghz/i5/8Gb
The Machine i have is a A1502 EMC2678 2.4ghz/i5/8gb
Thanks!
as this one kindly uploaded is a A1502 EMC2875
Retina, 13-inch, Mid 2014 2.6Ghz/i5/8Gb
The Machine i have is a A1502 EMC2678 2.4ghz/i5/8gb
Thanks!
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8 years 8 months ago #853 by VIPER_GE
VIPER_GE
Replied by VIPER_GE on topic A1502 (early2014) 820-3467-A
if motherboard same as 820-3467-A it possible, just 1st read twice your efi firmware and SAVE. if motherboard diffirent number aka 820-3467-B do not flash my firmware posted. best regards.
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8 years 8 months ago #855 by drexxx
Replied by drexxx on topic A1502 (early2014) 820-3467-A
Hi Please check i think you mixed numbers and its NOT 820-3467-A
BUT ACTUALLY 820-3476-A ?
Thank you.
BUT ACTUALLY 820-3476-A ?
Thank you.
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8 years 8 months ago - 8 years 8 months ago #856 by VIPER_GE
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Replied by VIPER_GE on topic A1502 (early2014) 820-3467-A
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Last edit: 8 years 8 months ago by VIPER_GE.
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8 years 7 months ago #1138 by van Wyk
Replied by van Wyk on topic A1502 (early2014) 820-3467-A
I have 2 A1502 machines.
1- 2.6ghz i5 mid 2014 board nr. 820-3476-a 4278u processor. Liquid damage. Board dead. 256ssd encrypted
2- 2.6ghz i5 late 2013 board nr. 820-3476-a 4288u processor Liquid damage. Repaired, starting up with question mark folder. EFI password.
I have soldering skills, but I don't have a eprom programmer.
Can I use the chip from the dead board on the EFI locked machine?
Is it possible to format and use the encrypted ssd?
Sorry for stupid questions.
I have experience with board level repair, but I'm a noob wit EFI.
1- 2.6ghz i5 mid 2014 board nr. 820-3476-a 4278u processor. Liquid damage. Board dead. 256ssd encrypted
2- 2.6ghz i5 late 2013 board nr. 820-3476-a 4288u processor Liquid damage. Repaired, starting up with question mark folder. EFI password.
I have soldering skills, but I don't have a eprom programmer.
Can I use the chip from the dead board on the EFI locked machine?
Is it possible to format and use the encrypted ssd?
Sorry for stupid questions.
I have experience with board level repair, but I'm a noob wit EFI.
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8 years 7 months ago #1139 by token.paul
Replied by token.paul on topic A1502 (early2014) 820-3467-A
I think on both questions answer - yes. BIOS-s identical for same models and you can take flash chip from dead board. But it may have EFI password too since it has encrypted disk. Usually users who are use a full disk encryption setup EFI password as well.
Encrypted disks may be reused. You just need reformat it.
Encrypted disks may be reused. You just need reformat it.
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8 years 7 months ago #1141 by van Wyk
Replied by van Wyk on topic A1502 (early2014) 820-3467-A
I swapped the chip. I know there is no efi password set on it.
The machine boots to the login screen, but the response seems very slow. Mouse cursor freezes.
Did pram reset. Still slow.
For removing the sad encryption, I will probably need a adapter?
The machine boots to the login screen, but the response seems very slow. Mouse cursor freezes.
Did pram reset. Still slow.
For removing the sad encryption, I will probably need a adapter?
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8 years 7 months ago #1143 by token.paul
Replied by token.paul on topic A1502 (early2014) 820-3467-A
Several variables like PchInit, Setup, SetupDefaults set in EFI environment and can not be changed by PRAM reset. Because this procedure delete data for one UUID only. Probably it is a reason, but we need to know what that data is exactly. But it may be consequence of the physical damage. Well without programmer it is a guessing.
You can reformat encrypted disk installed in machine, just boot from USB flash and launch Disk Utility before fresh system installation.
www.macworld.com/article/2367748/how-to-make-a-bootable-os-x-10-10-yosemite-install-drive.html
You can reformat encrypted disk installed in machine, just boot from USB flash and launch Disk Utility before fresh system installation.
www.macworld.com/article/2367748/how-to-make-a-bootable-os-x-10-10-yosemite-install-drive.html
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8 years 7 months ago #1146 by van Wyk
Replied by van Wyk on topic A1502 (early2014) 820-3467-A
Thank you. Will invest in a programmer. Will need to do my homework on efi programming first. So far it looks like reading the dump with hex editor might be the way to go?
Re ssd: I've got a bootable external with Yosemite on it. Disk utility won't let me format without providing the encryption password.
Any way around that?
I'm dealing in insurance salvage Mac's. Seems like this is gonna make my life difficult.
Re ssd: I've got a bootable external with Yosemite on it. Disk utility won't let me format without providing the encryption password.
Any way around that?
I'm dealing in insurance salvage Mac's. Seems like this is gonna make my life difficult.
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8 years 7 months ago #1147 by token.paul
Replied by token.paul on topic A1502 (early2014) 820-3467-A
Are you tried to delete a partition or change a partition schema before format?
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8 years 7 months ago #1149 by van Wyk
Replied by van Wyk on topic A1502 (early2014) 820-3467-A
Yes, I did. Will order a adaptor and try MacDrive or another programme from windows.
The processor on the 2 machines is slightly different, maybe thats why swapping the ic doesn't work.
The processor on the 2 machines is slightly different, maybe thats why swapping the ic doesn't work.
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8 years 7 months ago #1150 by token.paul
Replied by token.paul on topic A1502 (early2014) 820-3467-A
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8 years 7 months ago #1151 by thaGH05T
If I helped you, buy me a beer!!! Happy Hunting...
Replied by thaGH05T on topic A1502 (early2014) 820-3467-A
Yea i think there is a mismatch happening that has got your system in an inconsistent state. The best thing to do is to not damage the chips you have and get a raspberry pi and follow my tutorial on reading the chips. Place the firmware here and either myself or token.paul can help clean it for re flashing. You will need to place the original chips back on their respective boards
If I helped you, buy me a beer!!! Happy Hunting...
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