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TUSB9261固件刚烧进去时用，重新拔插USB也可以用，就是不能断电，断电了就要重新烧写固件（固件是默认的v1.05版本的
参考一下TUSB9261 flash burner 的user's guide，看是否按照里面的步骤完成的：
http://www.ti.com/lit/ug/sllu125d/sllu125d.pdf
还是不行，造成这一现象的原因有哪些呢？
