those keys are write only is why you cant read them,to read them you will have to dump the nand,if you need to change them from what they already are just write the new values to them,otherwise they are already there.
keys in most phones today are told to write keys then delete them from the nv,so really its not that you cant read them,its that they are not there,the reason is to keep you from reading and or cloning them.
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