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You not only deleted the recovery partition but also the System partition.
It isn't the missing recovery partition that is preventing from the conversion. It is the system partition (first partition, NTFS -100M)
Did you disabled the recovery partition (reagentc /disable) before deleting the partition?
Open a CMD window as administrator and type:
reagentc /info
Do you have any disk manager like Minitool or Aomei partition? If you do, you can create a EFI partition, load the boot manager on it and then convert the drive from MBR to GPT. Easy task.