使用 fastboot oem unlock来对nexus 9解锁 .

http://www.droid-life.com/2013/11/04/how-to-unlock-the-nexus-5-bootloader/ http://www.inexus.co/thread-18503-1-1.html http://www.ibtimes.co.uk/how-root-google-nexus-9-unlock-bootloader-1473817 开启程序员选项

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