Hello,
Thank you for posting in Microsoft Community forum.
Based on the description, I understand your question is related to cannot enter alpha letters.
1. Open settings/ time&language, check your language settings and keyboard settings.
- Use a different keyboard to see if this issue can be fixed.
- Press the Num Lock key on your keyboard to toggle between numeric and alphabetic input.
- If you have a laptop, you might need to use the Fn key in combination with the Num Lock key to switch modes.
Additionally, the 48-digit BitLocker recovery password will be like below format:
111111-222222-333333-444444-555555-666666-777777-888888
Have a nice day.
Best Regards,
Molly