If BitLocker is asking for Recovery Key after Windows Update, and you don't have the BitLocker Recovery Key, see this post ...
BlackLotus, which is a bootkit, has been doing the rounds on the internet since last year. This bootkit is capable of bypassing Secure Boot, disabling BitLocker, Microsoft Defender, and more.
If you have the BitLocker recovery key, you can unlock the BitLocker encrypted hard drive partition through the Control Panel. However, if your Windows OS is corrupted and you cannot boot into Windows ...