fastboot烧写XBL文件出现如下错误，怎么办？

C:\Users\tom>fastboot flash xbl C:\Users\tom\Desktop\xbl.elf
sending 'xbl' (2503 KB)...
FAILED (command write failed (No such device or address))
finished. total time: 0.004s

烧之前端口是好的，烧完fastboot就挂了。