General question about recalls involving software flash?

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DM58

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With software updates such as 67a that claim to be irreversible, where does the information get flashed? And, if it is a replaceable unit such as PCM, can a truck be returned to pre software update status by replacing the memory?
 

06 Dodge

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With software updates such as 67a that claim to be irreversible, where does the information get flashed? And, if it is a replaceable unit such as PCM, can a truck be returned to pre software update status by replacing the memory?
The flash is for the PCM, as I understand it unless your truck is tuned with after market programing there is no way to roll back the 67a flash.
 

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