EVM430-FR6043: Error connecting to the target: The Debug Interface to the device has been secured

Part Number: EVM430-FR6043

EVM430-FR6043正常使用中,我把以下的demo工程:
C:\ti\msp\UltrasonicGasFR6043_02_30_00_01\examples\MSP430FR6043EVM_USS_Gas_Demo (compile project)
C:\ti\msp430ware_3_80_14_01\dsplib\MSP430FR6043EVM_USS_Gas_Demo\EVM_v2_0_AFE3v3\MSP430FR6043EVM_USS_Gas_Demo.txt (flash file)

下载到评估板后,还是可以正常工作。在USS软件中,当我把如下图中的“Capture Duration(us)”配置为很小的数时(5或4),更新后“Request Update”,评估板变成“HID Bridge connected--waiting for device”无法通信。
当我想通过升级程序来恢复通信时,如下面的图所示,出现“TI MSP430 USB1/MSP430:Error connecting to the target: The Debug Interface to the device has been secured”,评估板好像被保护了。
因此,我希望通过串口UART的“BSL”更新程序来恢复通信。如下面图所示,根据通信协议,似乎是密码错误!我的评估板用的好好的,为什么出现了保护密码?请问我应该怎么恢复我的评估板使用呢?谢谢!
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(1)My EVM430-FR6043 is good,it work ok! I flash the following demo project to EVM with USB.
C:\ti\msp\UltrasonicGasFR6043_02_30_00_01\examples\MSP430FR6043EVM_USS_Gas_Demo (compile project)
C:\ti\msp430ware_3_80_14_01\dsplib\MSP430FR6043EVM_USS_Gas_Demo\EVM_v2_0_AFE3v3\MSP430FR6043EVM_USS_Gas_Demo.txt (flash file)

(2)EVM430-FR6043 is good,it work still ok!
(3)in “USS.exe”,I set“Capture Duration(us)”to a small number (5 or 4),EVM became “HID Bridge connected--waiting for device”,unable to communicate。
(4)I want to reflash EVM with USB,but “TI MSP430 USB1/MSP430:Error connecting to the target: The Debug Interface to the device has been secured”appeared,it seem to be protected for EVM。
(5)so,I want to reflash EVM with UART-BSL,but it seem have a protected password,why? My EVM430-FR6043 were good,it worked ok!It no password!but it is not good now. What's my problem?What should I do?Thanks.   see the following figures,please.