Two Windows 10 installations, only one recognized in boot files

In a computer there were two separate Windows 10 installations on two different Hard Disks. But the boot files were in Hard Disk 1.

Now Hard Disk 1 is formatted completely and the Windows 10 on it is reinstalled. But this new installation could not recognize the Windows installation on Hard Disk 2. How can I revive the Windows Installation on Hard Disk 2? Is there any boot manager to fix it?

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