Replaced OS.name.1 after OS recovery Right away OS-name.0 would be running meantime or alone?

Question

OS recovery DONE Right away OS-name.0 been replaced to OS.name.1 that advised from anti-virus engineer since 2013 .

Because of met OS.name.0 being put bitlock, that not from me as PCname replaced right away using own insisted one OS.name.1 machine, am hinged at AdvanceRecover by it, due to manage-bde - key won't be detected with the cmd, example yes works? OS-name.0 it would be running meantime or alone, though OS.name.1 off power aside me, this OS.name.0 operating somewhere please?

How to get manage-bde for this OS.name.0 recovery bitlocker key?