Upgrade bios on Dim E521 from 1.1.6 to 1.1.11

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Upgrade bios on Dim E521 from 1.1.6 to 1.1.11

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Per Dell Support Center the current BIOS version for the E521 is 1.1.11.  I have 1.1.6, but when I try to update I get the "unsupported system" error message.  Do I have to install all incremental versions in sequence?

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