How to can I access my pc after I updated my bios and can't find my device on my Microsoft account and can't put in the bitlocker key

Hi,

Thank you for the detailed explanation, I understand how stressful this situation must be.

After a BIOS update, Windows may trigger BitLocker recovery due to a hardware change. Unfortunately, Microsoft Support cannot provide access to your device, IP address, or bypass BitLocker. BitLocker is a security feature designed so that only the owner with the recovery key can unlock the device.

The only place you can find the BitLocker recovery key is in the Microsoft account that was used to set it up, whether it is a personal account or a work or school account.

Personal Microsoft account:

https://account.microsoft.com/devices/recoverykey

Work or school account:

https://aka.ms/aadrecoverykey

If you did not set up BitLocker on your computer yourself, it is most likely that it was enabled by default by the manufacturer or by the person who initially set up your computer.

If you cannot find the recovery key, I’m sorry, but there is no way to bypass BitLocker. In this situation, formatting the hard drive and performing a clean installation of the Windows OS will be necessary. Please note that this process will result in data loss.

Find an empty USB drive with at least 8 GB of space and a working computer, then follow the steps below:

1. Click this link: https://www.microsoft.com/software-download/windows11

Under Download Windows 11 Disk Image (ISO), Click on "Download tool now."

2. Run the tool, create a bootable USB drive or ISO file, and deselect the 'Use the recommended options for this PC' box to choose the correct language and edition.

Once the process is done:

1. Connect the installation media to your PC.
2. Start your PC and press any key to continue. Click Next > Click Install Now.
3. When the Windows Setup starts, follow the on-screen instructions.

Note: If prompted for a product key, click 'I do not have a product key' and then click Next.

Make sure you install the same edition of Windows 11 (Home or Pro) that you previously had installed to avoid activation issues.

For a step-by-step guide with illustrations, click the link below and scroll down to the 'Steps to reinstall Windows with media' section, then expand the 'Clean install' option:

https://support.microsoft.com/windows/reinstall-windows-with-the-installation-media-d8369486-3e33-7d9c-dccc-859e2b022fc7

Updating BIOS can trigger BitLocker recovery. Without the correct BitLocker recovery key, access to the existing Windows installation and data is not possible, and Microsoft Support cannot generate or bypass a BitLocker key, provide an IP address to unlock the device, or otherwise decrypt the drive.

Key points based on the described situation:

1. Why the device is asking for a BitLocker key after BIOS update
   • BitLocker uses hardware and firmware measurements (including Secure Boot/TPM/BIOS state). A BIOS or Secure Boot change can cause BitLocker to require the 48‑digit recovery key before Windows will start.
2. Where the BitLocker key might be
   • If Device Encryption or BitLocker was automatically enabled, the recovery key is typically saved to:
     • A Microsoft account or work/school account associated with the device.
     • For managed/organization devices, the organization’s IT may have the key.
   • If the device was managed by an organization in the past, that organization might still be the only place where the key is stored.
   The BitLocker overview explains that depending on how BitLocker was activated, the key is either in a Microsoft account/work or school account, chosen by the person who turned it on, or held by the managing organization.
3. If the device no longer appears under the Microsoft account
   • If the device is not listed under the Microsoft account device list and the key is not found in any of the usual locations, there is no supported way for Microsoft Support to recreate or look up the key.
   • Microsoft Support and Microsoft Q&A moderators explicitly state that if none of the documented locations contain the key, it cannot be retrieved by anyone, including Microsoft.
4. What Microsoft Support can and cannot do
   • Cannot:
     • Provide or reconstruct a BitLocker recovery key.
     • Unlock or decrypt the drive without the key.
     • Use IP address or any other internal data to bypass BitLocker.
   • Can:
     • Help with guidance on resetting or reinstalling Windows (which will erase the encrypted data) if the key truly cannot be found.
5. Options if the key cannot be found anywhere
   • If all documented methods to locate the BitLocker key fail (no key in any Microsoft/work/school account, no printout, no USB backup, and no organization holding it), the only remaining option is to reset or clean‑install Windows, which results in loss of the existing encrypted data on that drive.
   • For a clean install, boot from Windows installation media (USB) created on another PC and perform a custom install, deleting partitions as needed. In that scenario, BitLocker recovery is not required because the drive is being wiped and Windows is being installed fresh.

In summary, access to the current Windows installation and files requires the exact BitLocker recovery key. If that key cannot be located in any of the documented places and the device is no longer associated with an account that holds the key, neither Microsoft Support nor any other party can unlock the drive. The only supported path forward is reinstalling Windows, which removes all existing encrypted data.

References:

• Windows devices for home users, businesses, and schools with Microsoft-managed updates
• BitLocker overview
• BitLocker recovery key prompt on the Surface Book 2 13" after the August 2018 UEFI update
• Surface Pro 3 blocked - Microsoft Q&A
• Request for Assistance with BitLocker Recovery – Surface Pro 2 - Microsoft Q&A
• Unable to recover Bitlocker key and unable to reload Windows 11 - Microsoft Q&A