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Microsoft has pulled its Surface Pro 2 firmware update that it delivered on December 10 due to reported problems with excessive battery drain



From All About Microsoft:
"To ensure the best experience for our customers during the holiday season we have taken steps to remove the update for Surface Pro 2 that was previously published through Windows Update on December 10th, 2013. We are working to release an alternative update package after the holidays," confirmed a Microsoft spokesperson.

Microsoft isn't offering users any kind of workaround or additional advice -- at least not at this point.
  Microsoft pulls faulty Surface Pro 2 firmware update