BitLocker Key ID Matching How to Pick the Right Recovery Key
You found a recovery key, typed all 48 digits — and the PC rejected it and looped back. In most cases the key itself is genuine. It just belongs to a different drive. This guide fixes the matching, not the typing.
✍️ Technical Anshu🪟 Windows 10 / 11⏱️ 5 minute guide
🎥 Watch the full process in the video — finding the recovery key and unlocking the drive, shown live step by step
Every BitLocker recovery key is paired with a Key ID — a short identifier printed right on the blue recovery screen. The key only unlocks the drive whose Key ID it belongs to. A family Microsoft account quickly collects keys for the home PC, the office laptop, an old machine and a second drive, and they all look identical: 48 digits in 8 groups. If you grab the wrong one, Windows gives no helpful error — the screen simply comes back and asks again. Here is how to match correctly the first time.
Two Key IDs That Do Not Match — the Real Reason for Rejection
Key ID on your blue screen3F2A91BC
Key ID of the key you typed8C41D0E7
ResultRejected — loops back
Key ID you actually need3F2A91BC entry
The digits are examples. What matters is the rule: the first 8 characters on your screen must match the first 8 characters of the entry you use.
1
Copy the Key ID from the Blue Screen Exactly
The recovery screen prints the identifier of the key it wants. On Windows it appears as a line like "Recovery key ID" or "Key ID" with a code in groups.
Take a clear photo of the recovery screen before doing anything else
Write down the first 8 characters of the Key ID — that much is enough to identify the right entry
Note the drive label too if the screen shows one (for example the OS drive)
2
Match the Same 8 Characters in Your Account ⭐
Open the saved keys list on another device and compare identifiers, not key digits — the 48 digit keys themselves all look the same and comparing them is hopeless.
Open https://aka.ms/myrecoverykey and sign in
Look at the Key ID column of every entry, including entries for other device names
Pick the one entry whose Key ID starts with the same 8 characters as your screen
Read out that entry's full 48 digit recovery key and type it on the locked PC
In the video above, the matching is shown on a real account list with several saved keys — the exact situation that confuses most people.
3
If the Rejected Key Came from a File or Printout
Printouts and USB text files also carry the Key ID — it is printed at the top of the sheet and is part of the text file name and content.
Check the file name — it looks like BitLocker Recovery Key 3F2A91BC.txt, where the code is the Key ID
If the code in the name does not match your screen, that file belongs to another drive — keep searching
Inside the text file, the "Recovery Key ID" line confirms the match before you type 48 digits for nothing
4
No Entry Matches Anywhere You Looked
A missing match is information: the key for this drive was saved in a place you have not checked yet.
Try the other accounts — whoever set up the PC, and any work or school account at https://aka.ms/aadrecoverykey
Remember that one PC can hold two different keys — one for the Windows drive and another for a data drive
Accept the hard limit honestly: if no matching Key ID exists anywhere, there is no way to derive or guess the right key — the digits cannot be worked out from the Key ID
🔴 Do not keep typing keys at random. Guessing does not lock you out permanently, but it wastes time and proves nothing. The Key ID is the only test that matters — match it first, then type once, carefully.
🎥 Watch the Complete Process in the Video
Finding the recovery key and unlocking a real BitLocker locked drive — complete knowledge, step by step.
Where exactly is the Key ID shown on the recovery screen?
On the blue BitLocker screen, near the key input area — it is labelled Key ID or Recovery key ID and shown as a code in groups. The first group of 8 characters is what you compare with your saved list.
My key worked on this PC before. Why is it rejected now?
If the drive was decrypted and encrypted again, or Windows was reinstalled, a new recovery key with a new Key ID was created and the old one is retired. Check the upload date in your account and use the newest entry whose Key ID matches the current screen.
Can I identify the right key from the device name alone?
Not safely. Device names repeat (two laptops can both be called DESKTOP or LAPTOP), and one device can have several drives and keys. The Key ID is the only reliable match.
This guide is based on the Technical Anshu video linked above • Stuck on a step, ask in the video comments and the community will help you 🙏