BitLocker ties your disk-encryption key to the TPM chip and to a profile of the machine. Change too much and BitLocker asks for the recovery key on the next boot. A little preparation avoids that.
Step one: save your recovery key
Before changing anything, get your BitLocker recovery key. You can find it in your Microsoft account at aka.ms/myrecoverykey, or view it in Windows with the command manage-bde -protectors -get C:. Without that 48-digit key, a locked drive means lost data — so save it in a password manager (Bitwarden, 1Password) and keep it there.
What a normal HWID change does to BitLocker
HWIDChanger changes software-level identifiers — Windows IDs, the disk volume serial and network adapter (MAC) addresses. BitLocker's chain of trust runs through the TPM, which these changes do not touch. So a standard HWID change does not trigger the recovery-key prompt.
If BitLocker does ask for the key
Don't panic. Enter the 48-digit recovery key, let Windows boot, and the system continues normally — your data is safe. The drive is not re-encrypted; BitLocker simply re-confirms the machine.
Good practice
If you ever make deeper firmware-level changes — a BIOS update, for example — suspend BitLocker first with manage-bde -protectors -disable C:, make the change, then re-enable it. And regardless of what you change, always keep that recovery key somewhere you can reach it.