1. hjbonfanti's Avatar
    I was updating my Dell Venue Pro 8 to Windows 10 Build 10547 and got a red error message that read. "Secure Boot Violation" "Invalid signature detected. Check Secure Boot Policy in Setup". There is an OK button at the bottom of the message, but nothing happens when I try to click on it. I can shut the tablet off, but when I start it I get the same message. I am stuck. Where to I go from here. Any ideas?
    09-19-2015 09:57 PM
  2. DWTrump's Avatar
    I just ran into this and found the "solution" on the Microsoft Insider Answers Forum (I can't post the link since I don't have enough posts yet). I just did a Bing search for Venue Pro 8 "Secure Boot Violation" and it was the first link.

    Apparently, there is an incompatibility between Secure Boot and this build. Turning off Secure Boot until they fix it in the next build is the only way to get past it. My tablet is currently going through the remaining setup ("Upgrading Windows" with the circular progress dial), so I'll update this if something fails, but looks like I am on my way now.

    Quick steps - turn on tablet, and hold down the volume down button to enter BIOS. Turn off Secure Boot. Reboot. Enjoy!
    Azizelh, Bcroc and iSingBass like this.
    09-20-2015 08:01 AM
  3. hjbonfanti's Avatar
    I figured this out and got the update to complete. However, once I disabled secure boot I was required to enter my bitlocker key each time I turned on the tablet. The fix I figured out for this was to type "manage bitlocker" in search and then turn off bitlocker encryption. This take a while to complete, but it worked. Tablet is now working fine.
    iSingBass likes this.
    09-21-2015 08:06 AM
  4. James8561's Avatar
    I'm still on win8.1 and I installed some optional updates last night and it rebooted fine. Put it on hibernate. Woke up this morning with a broken tablet showing invalid secure boot. Looks like Microsoft broke it.
    09-21-2015 01:15 PM
  5. iSingBass's Avatar
    I've had exactly the same experience so far so it's at least nice to know that I didn't do something stupid.
    09-24-2015 03:02 PM
  6. BaritoneGuy's Avatar
    Anybody have a more permanent solution for this? I really don't want to decrypt the whole drive and dislike having to enter the key after a shutdown.
    10-07-2015 09:52 AM
  7. Kavu2's Avatar
    10/13/2015
    Alert!
    Today's MS Windows updates have fixed the secure boot issue!
    So go into BIOS and enable Secure Boot, save config and exit, restart and...
    Boom....no....red....'Secure Boot Violation'....box!
    And.....(in my case) .... the encryption option has returned to the PC info page

    Thank you Microsoft ....slow but much appreciated.

    Edit (10/14/2015) to add...
    Just adding in for any future search refs, it was Microsoft's update KB3084905 which was re-issued to correct the issue with the Boot Manager (bootmgfw.efi).
    Microsoft KB3084905 info page here:
    https://support.microsoft.com/en-us/kb/3084905
    Last edited by Kavu2; 10-14-2015 at 01:41 PM.
    10-13-2015 01:26 PM

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