我刚刚在Nexus 5(Android 6.0.1)上尝试过此方法，并且有效:

I just tried this on my Nexus 5 (Android 6.0.1) and it worked:

• 确保您的手机未通过USB电缆连接到任何设备
• 转到设置"-开发人员"选项-选择USB配置"
• 设置所需的默认连接类型

诀窍是让手机与USB断开连接.我猜想这种行为背后的想法是，如果在手机未连接到任何设备的情况下设置USB连接类型，它将被视为默认行为.

The trick was to have a phone disconnected from USB. I guess the idea behind such a behavior was that if you set an USB connection type while your phone is not connected to any device, it will be treated as a default behavior.