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Possible to boot OS originally installed MBR after converting disk to GPT?

I have Windows 10 and 7 on my hard disk. I installed Windows 10 on a partition on the disk, GPT, converted the disk to MBR, installed Windows 7 on another partition, then converted the disk back to GPT. After some fixing Windows 10 boots but Windows 7 is not detected at all even when switching to legacy mode. Any way to make Windows 7 run on GPT?