Aurora R4 Overclocking options blocked when upgrading from Bios A05 to Bios A06

I have an Aurora R4 with i7 3930K @3.2 and Windows 7 Home Premium 64 bit. I have just updated my Bios from A05 version to A06 version and after entering the new Bios I noticed that Overclocking is no more possible because all multipliers are locked! With A05 version I was running my i7 3930K @4.5 in all 6 cores and I bought an expensive cooling rig on my own in order to do that! Now I can't do that anymore! How does Dell dare to block the overclocking feature on our systems without any announcement? In the "Fixes & Enhancements" section of the A06 Bios Update (here) Dell only says "Windows 8 Supported BIOS" but it doesn't say "This Bios Version will block your overclocking features"!!! In the Aurora R4 website (here) I can read: "the Aurora enables an unlocked BIOS for custom". This was one of the reasons I bought my Aurora R4 and now Dell blocks this feature? It's not fair, it's not correct from Dell! I work with my PC and I need high CPU frequencies in all 6 cores. I have never heard of a Bios Update from any IT company that prevents users from overclock anymore! That's our choice, it's our money! Dell plays with our money? I will never buy an Alienware Desktop again in the future, I am really disappointed with Dell "despotic" manners: without any notice, without any announcement they prevent you from overclocking anymore. I have also tried to roll back to A05 and A03 versions but it does not work and A06 Bios version still remains. Any solutions?