Not sure if this makes a lot of sense, but execute
bcdboot H:\Windows to create a boot selection of old and new installation in the boot manager that's currently in use, which according to disc management resides on D0P3. :sarc:
Creates a dual boot. At least you'll have any access to the installation on Drive 0.
That's incorrect.
"The system partition (or system volume)[5] is a primary partition that contains the boot loader"
"The boot partition (or boot volume)[5] is the disk partition that contains the operating system folder"





D0P3. Disk 0 Partition 3, Volume H.D03P?