It has been remarked on a few places in the forums that the Venue 8 7840 series doesn't ship with Lollipop. I have been informed that Lollipop is expected to be available via OTA for the 7840 sometime in February

I will post again once I have specific dates when the OTA will be available and any information on the availability of Lollipop for other models of Dell tablets.

TB

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Currently the Lollipop OTA is expected on April 21 and it will be version 5.01. I will post here if I receive any new information.