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Switch to ULINK mode error

I have a new ULINK2 debugger with firmware 2.00. It is detected on uVision as CMSIS DAP. I want to switch it back to ULINK boot mode. I did follow https://developer.arm.com/documentation/101455/0100/Appendix/Utilities/Boot-Mode-Utility instruction but the command prompt shows the command: 

C:\Users\xxx\Downloads\3632>UL2_Configure B0
ULINK2 Configure Utility V1.0

Disconnecting ULINK ..........
Connecting ULINK Loader ....................
Error: ULINK Loader not detected!

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