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TMS320F28335: sci bootloader echo error

Part Number: TMS320F28335

Hi guys!!!

I have an one problem.I am  programming with rs232 on c2prog. But I am not programming with rs485(full dublex com.) I get the this error.

*** PLEASE RESET TARGET IN SCI BOOT-LOADER MODE ***
Connecting with target (autobaud)... OK.
Bootloading... failed (invalid echo)!

Could you help me?

Thanks...