manage-bde -upgrade Volume {-ComputerName|-cn} ComputerName {-?|/?} {-Help|-h} Description: Upgrades the BitLocker version. ...

manage-bde -upgrade Volume
                  [{-ComputerName|-cn} ComputerName]
                  [{-?|/?}] [{-Help|-h}]

Description:
    Upgrades the BitLocker version.

Parameter List:
    Volume      A drive letter followed by a colon. Example: "C:"
    -ComputerName or -cn
                Runs on another computer. Examples: "ComputerX", "127.0.0.1"
    -? or /?    Displays brief help. Example: "-ParameterSet -?"
    -Help or -h Displays complete help. Example: "-ParameterSet -h"

Examples:
    manage-bde -upgrade C: