用9008把userdata分区导出, 参考:https://zhuanlan.zhihu.com/p/35422254 可能会失败
windows api readfile failed your device is probably not on this port 01:47:56: ERROR: function: sahara_rx_data:194 Unable to read packet header. Only read 0 bytes. 01:47:56: ERROR: function: sahara_main:854 Sahara protocol error …