Hi, We have now rolled out approx 200 (HP) PC's with Win7x64 and Bitlocker. Unfortunately we see a few cases where the PC's boot in Bitlocker screens. Today we found _one_ reason we can replicate: Change the display language at startup (Preferred Locale) via Control panel / Region and Language / Administrative / Copy Settings (tick the "welcome screen and system accounts" option) and click "OK" This will change \windows\system32\winload.exe (BCD PreferredLokale - 0x12000005) but appearently not report back to Bitlocker (or whatever) causing a Bitlocker screen at next reboot. Is what we see a bug? Are we doing something wrong with our golden image? Thanks for your ideas!

Hi, I donot think it is a bug. If one of the early boot files is modified, Bitlocker will enter Bitlocker Recovery Mode. Please suspend Bitlocker before making this change.Juke Chou TechNet Community Support

Hi Juke, That's not a fair reply. Bitlocker is a centrally managed application with automatic AD-integration whereas the locale-settings are defined per-PC and each user can change this. Region and Language settings are a standard feature from Windows that when changed willingly should not trigger a bit-locker block. Neither can we inform users of this requirement.

Hi, You need to use Process Monitor to indentify whether the early boot files will be changed when modifying locale. If it is indeed changed, this is by design that Bitlocker will enter Recovery Mode after that change. Juke Chou TechNet Community Support

Why do I even bother writing here? These answers are so worthless.

Hi, Sorry for that, I will help you test that. If get any info, will post back. Juke Chou TechNet Community Support

Hi, After research, I found the following information. If the user wants to apply language settings to All users and system accounts. If this option is selected, it will change the local computer BCD settings (if the user-only option is selected, BCD settings are not changed). This change will result in a modification of a BCD setting to the new locale value. If you are using a TPM with BitLocker, this is interpreted as a boot attack on reboot and the computer will require that the user enter the recovery password or recovery key to start the computer. http://technet.microsoft.com/de-de/library/ee449438.aspx Juke Chou TechNet Community Support

Hi, After research, I found the following information. If the user wants to apply language settings to All users and system accounts. If this option is selected, it will change the local computer BCD settings (if the user-only option is selected, BCD settings are not changed). This change will result in a modification of a BCD setting to the new locale value. If you are using a TPM with BitLocker, this is interpreted as a boot attack on reboot and the computer will require that the user enter the recovery password or recovery key to start the computer. http://technet.microsoft.com/de-de/library/ee449438.aspx Juke Chou TechNet Community Support