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请参看
http://www.ti.com/lit/an/slaa450e/slaa450e.pdf
到下面的链接下载Bootloader
http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSPBSL_CustomBSL430/latest/index_FDS.html
把USB BSL重新烧一下
MSP430BSL_1_00_12_00.zip\5xx_6xx_Released_BSL_Images\MSP430F552x_550x_Family\USB BSL
下次擦除的时候尽量不要擦到BSL段