1.    29 Sep 2015 #1
    Join Date : Apr 2015
    Posts : 17
    Win 10

    EC: 0xC004C003 - cannot activate windows after upgrading to x10547

    After upgrading to 10547, getting EC: 0xC004C003

    Anyone else getting this. Is there a specific product key I need for this build?

    Thanks in advanced
      My System SpecsSystem Spec

  2.    29 Sep 2015 #2
    Join Date : Jul 2015
    Posts : 2,552
    10 Pro

    I've had this a couple of times (works for a bit and then loses activation). Best is to restore back to your previous activated build and upgrade again if running slmgr /ato doesn't work.

    You don't need a key for 10547 or any recent build (and nor is there one).
      My System SpecsSystem Spec


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