解锁bootloader的步骤(bootloader解锁方法)

BL即bootloader，是开机引导程序,BL锁类似于电脑的BIOS密码，下文以小米手机为例说明。

查询BL锁状态：

android 6.0以前（不含）：通常不加锁

android 6.0以后：

方法一：关机状态下，按电源+音量减进入FASTBOOT模式，此时可看见locked , unlocked , relocked 等状态。我这个没解锁，也没显示状态。

方法二：开机状态下，打开开发者选项 - USB调试 - 设备解锁状态

方法三：用命令fastboot oem device-info，此时要先下载ADB工具、手机进入FASTBOOT模式、打开CMD命令窗口输入查询命令

ADB工具

<span>C:\\tmp\\fastboot>fastboot</span> <span>oem</span> <span>device-info</span>                                                   <span>(bootloader)</span> <span>Verity mode:</span> <span>true</span><span>(bootloader)</span> <span>Device unlocked:</span> <span>false</span><span>(bootloader)</span> <span>Device critical unlocked:</span> <span>false</span><span>(bootloader)</span> <span>Charger screen enabled:</span> <span>true</span><span>OKAY</span> <span>[</span>  <span>0.</span><span>013s]</span><span>Finished. Total time:</span> <span>0.</span><span>018s</span>

解锁方法：慎用此功能

低版本用：

fastboot oem <span>lock</span>      上BL锁fastboot oem <span>unlock</span>  解BL锁c:\\tmp\\fastboot>fastboot oem <span>unlock</span>                                                   OKAY [ <span>30.582</span>s]Finished. Total <span>time</span>: <span>30.591</span>s另一个手机的解锁：c:\\tmp\\fastboot>fastboot oem <span>unlock</span>                                                   (bootloader) <span>Start</span> <span>unlock</span> flowOKAY [ <span>29.972</span>s]Finished. Total <span>time</span>: <span>29.983</span>sc:\\tmp\\fastboot>fastboot oem <span>lock</span>                                                   (bootloader) <span>Start</span> <span>lock</span> flowOKAY [ <span>43.440</span>s]Finished. Total <span>time</span>: <span>43.449</span>s

高版本用：

<span>fastboot</span> <span>flashing lock      给BL上锁</span><span>fastboot</span> <span>flashing unlock  解BL锁</span>

oppo基本没开放BL锁，魅族、小米开锁需要用账号向官方申请。

先点击：开发者选项 - OEM解锁/设备解锁状态 - 绑定账号和设备 - ...

这里输入手机自设的开机密码

点击“绑定账号和设备”