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flyproductions

macrumors 65816
Jan 17, 2014
1,086
461
PS: soldering the right eeprom also solves this thing
Sounds to me like the much easier way, as no decompressing, decrypting, knowing the device-id of the present EEPROM, re-encrypting, recompressing is needed. The encryption-part alone looks somehow impossible to me while the necessary soldering-job is a relative simple task.
 
Last edited:

m32501

macrumors newbie
Oct 8, 2020
2
2
Sounds to me like the much easier way, as no decompressing, decrypting, knowing the device-id of the present EEPROM, re-encrypting, recompressing is needed. The encryption-part alone looks somehow impossible to me while the necessary soldering-job is a relative simple task.

Should be but the other way would probably make other cards possible. The only difficult thing is to decrypt the data part and I am sure that there is someone out there who knows the solution.
Another solution would be still to write a new open source efi for the cards but this one will loses relevance the more devices are replaced by newer macs.
 

flyproductions

macrumors 65816
Jan 17, 2014
1,086
461
The only difficult thing is to decrypt the data part...
...if there is no additional "security mechanism" present which .i.e. notices edits to the given data part an in this case stops it from working!

In the MVC roms for the NV Pascal cards for example a simple switching of two "funtional uncritical" bytes, two numbers in the release date or similar, in the VBIOS is enough to stop the rom from functioning.

Nice cat and mouse game, by the way! ?
 

netkas

macrumors 65816
Oct 2, 2007
1,198
394
Should be but the other way would probably make other cards possible. The only difficult thing is to decrypt the data part and I am sure that there is someone out there who knows the solution.
Another solution would be still to write a new open source efi for the cards but this one will loses relevance the more devices are replaced by newer macs.
first good idea on few last pages of this thread.
 
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