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New Bios for the M14x R2 is up on the Dell site, includes one fix besides Win8.1 support:

Fixed-add Win8.1 OS type

-support Fn+F1/F2/Pause function.

Link: Driver Details | Dell US

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could you please help us with a bios and vbios mod of this firmware? And if possible can you help me with increasing or unlocking the voltage while on p5 state if that is possible?

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Is it worth updating to this version? Or should I wait for an unlocked version?

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      Thread link for more information and discussion:

       
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