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C2000-GANG: c2000-GANG ERROR66: CSM unlock error for TMS320F28054M

Part Number: C2000-GANG
Other Parts Discussed in Thread: TMS320F28055, TMS320F28054M, , UNIFLASH

Hi TI,

I am using C2000-GANG to program both TMS320F28055 and TMS320F28054M, TMS320F28055 has no problem to be programmed with C2000-GANG.

But TMS320F28054M kept giving me error 66: CSM unlock error.

BTW, I went back to use UNIFLASH to program the TMS320F28054M with XDS100v2 USB debugger, no issue. same hex file.

Any idea what can cause this problem?