Hi Liu,
Additionally please check whether MCU is correctly powered and gated (XCLKS pin,…).
Please check also BDM cable orientation…
Please touch MCU by finger. When MCU is hot, it is probably damaged...
I hope it helps you.
Have a great day,
Radek
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Hi,
You can unsecure the MCU in CW debugger mode
HCS12MultilinkCyclonePro -> Unsecure
If this doesn’t work, you can use PEmicro Unsecure12 utility.
Regards,
Daniel