I have multiple systems where I needed to change the DMI settings and painfully tested which option might work. I also started a thread to collect all these Information:
The process it is implemented now is not straight forward. Also new SSD like Samsung 840 EVO with self encryption (TCG Opal) are making many problems.
Would be great to see improvements here so that the DMI settings will not be needed anymore. Other solutions do not have these problems.