SMBIOS Question: Can you change values of the 5 fields at the bottom

[mdog474]

What do the 5 strings shown at the bottom of iMessageDebug/GenSMBIOS-List Current SMBIOS represent, and how can you change them?

They look like this (these are not mine):


Gq3489ugfi: 7ea157475fa74cb64c1f7d27561fe7c14c
Fyp98tpgj: 3f3ec0dce5e5fbc00db1d7ba8c29388073
kbjfrfpoJU: 6d2f4094aa53ad426d3921df6958fb7f76
oycqAZloTNDm: 1a2e290cf5ba465fdf10ff989437f00f58
abKPld1EcMni: 7ea157475fa74cb64c1f7d27561fe7c14c


I have a cloned disk that I somehow have messed up, and the value for the "kbjfrfpoJU" field is different between the original and the clone.
Is there a way to change the value on one so that they match?

 

[jaymonkey]

@mdog474,

Those five keys are dynamically generated by MacOS, it is not possible to manually set or inject them.
They are used as cryptographic seeds for the iMessage/iCloud security token layer.

The values are generated based on all the SMBIOS data such as Model Type, SM-UUID, S/N, MLB, ROM... etc as well as the UUID of the MacOS System Volume which is what i suspect has changed in your case.

It generally does not matter if one or more of these keys changes ... as long as the Critical System ID's (SM-UUID, S/N, ROM, MLB ... etc) remain the same then iMessage and iCloud should still work.

Cheers
Jay

 

[mdog474]

@jaymonkey If I need to re-login to iCloud whenever I switch between booting off the original and the backup is that typical? Or is that an example of the kind of issue that will get my account locked? Is there a definitive way to check that this is safe?

 

[mdog474]

All the fields above the 5 lines of crytographic hash match. It is just the middle, "kbjfrfpoJU" line that is different.
I tried a really old backup and it was the same thing...All the properties above the hash match, and all lines of the hash match except the 3rd line, "kbjfrfpoJU" is a different value, so that would make sense that it is related to the disk volume ID.

So is it save to conclude that as long as all properties above the 5-line hash match, then the backup should be fine to run off of?

 

[jaymonkey]

is it save to conclude that as long as all properties above the 5-line hash match, then the backup should be fine to run off of?

@mdog474,

Yes ..... as I far as I know (and I have done a lot of testing) as long as all the Critical System ID's ( SM / Hardware UUID, S/N, MLB, ROM ..etc) then iMessage and all other on-line services should continue to work.

I've seen one of the five hash key values change several times (usually "kbjfrfpoJU") and everything has been fine.

Cheers
Jay

 

[mdog474]

Thanks for the info @jaymonkey, I really appreciate it!

 

[balaramanim]

This information is very useful for me. Thanks.