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Diskpart - Can't delete a partition without the force protected parameter set

Is my disk locked in a permanent way?

You need to add the override option:

delete partition override

override

Enables DiskPart to delete any partition regardless of type. Normally,
DiskPart enables you to delete only known data partitions.

How to delete an OEM partition

"Cannot delete a protected partition without the force protection parameter set."

This is a warning from Windows that you need to be doubly sure that
you want to delete this partition.

If you see this error when trying to delete a partition then use:

delete partition override