Alienware 18 BIOS Questions X21

Question

Guys, I have a Alienware 18, i7 windows 7, 16 RAM etc.  My BIOS shows up as X21.  When I go to the download site to update the chip-set (completed) and the BIOS, it only shows up AW18A05.  When I go to install it the installer states 'Dell does not recommend that you flash your BIOS to a previous version.' even though the new BIOS is from this month, and the current one is from Mar 2013 So here is the question, 1. What is the most current BIOS for the Alienware 18 here is the info for it below from msinfo32 OS Name    Microsoft Windows 7 Home PremiumVersion    6.1.7601 Service Pack 1 Build 7601Other OS Description     Not AvailableOS Manufacturer    Microsoft CorporationSystem Name    System Manufacturer    AlienwareSystem Model    Alienware 18System Type    x64-based PCProcessor    Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz, 2701 Mhz, 4 Core(s), 8 Logical Processor(s)BIOS Version/Date    Alienware X21, 3/13/2013SMBIOS Version    2.7Windows Directory    C:\WindowsSystem Directory    C:\Windows\system32Boot Device    \Device\HarddiskVolume2Locale    United StatesHardware Abstraction Layer    Version = '6.1.7601.17514'User Name    Time Zone    Installed Physical Memory (RAM)    16.0 GBTotal Physical Memory    15.8 GBAvailable Physical Memory    12.8 GBTotal Virtual Memory    31.6 GBAvailable Virtual Memory    28.4 GBPage File Space    15.8 GBPage File    C:\pagefile.sys Secondly what is X21, and which should I be using?

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