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There are two methods.
First place, under the battery is the badge. The Rom version either A01 or A02 would be displayed to the right of "Service Tag".
However, as Dell has just upgraded to A02, its possible that they may have upgraded the ROMS on previous A01 models before shipment, but not rebadged.
Therefore, the best place is to select:
Start\Settings\System (Tab)
then select "System Information".
One of the items will be the ROM version which should show either A01 or A02.
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