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I am in the configuration below :

C: NTFS 296 GB
100 MB EFI System Partition
992 MB Recovery Partition
167 GB Unallocated Space

How can I merge [1] and [4] to get 463 GB on my C: drive?
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I think you don't need Partition Manager just use mbr2gpt tool from Microsoft : https://www.windowscentral.com/how-convert-mbr-disk-gpt-move-bios-uefi-windows-10

This worked well for me,
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