前置条件:
1 android nexue 5 手机一部
2 android L最新rom包
android L rom下载地址
https://developers.google.com/fit/preview#flash_your_nexus_5_or_nexus_7
过程：
下载完成后解压缩，这个包需要使用 fastboot工具，不是原来的zip卡刷包，好在里面的脚本文件
都已经写好了，如下图：
连接好手机和电脑，笔者是在ubuntu下的进行刷机，以下是刷机过程
nexus 5 手机需要进入到fastboot的模式，进入方式 按下开机键+音量上下键（也就是要按下音量键中间的部分）
在手机的 fastboot模式，执行下面的命令
root@ubuntu:~/Desktop/hammerhead-lpv81c# ls bootloader-hammerhead-hhz11k.img flash-base.sh flash-all.bat p_w_picpath-hammerhead-lpv81c.zip flash-all.sh radio-hammerhead-m8974a-2.0.50.2.08.img root@ubuntu:~/Desktop/hammerhead-lpv81c# ./flash-all.sh sending 'bootloader' (2508 KB)... OKAY [ 0.543s] writing 'bootloader'... OKAY [ 0.494s] finished. total time: 1.037s rebooting into bootloader... OKAY [ 0.040s] finished. total time: 0.040s sending 'radio' (45505 KB)... OKAY [ 6.213s] writing 'radio'... OKAY [ 3.118s] finished. total time: 9.332s rebooting into bootloader... OKAY [ 0.044s] finished. total time: 0.044s archive does not contain 'boot.sig' archive does not contain 'recovery.sig' archive does not contain 'system.sig' -------------------------------------------- Bootloader Version...: HHZ11k Baseband Version.....: M8974A-2.0.50.2.08 Serial Number........: 06ea489d00e2a439 -------------------------------------------- checking product... OKAY [ 0.101s] checking version-bootloader... OKAY [ 0.099s] checking version-baseband... OKAY [ 0.100s] sending 'boot' (8754 KB)... OKAY [ 1.420s] writing 'boot'... OKAY [ 0.754s] sending 'recovery' (9412 KB)... OKAY [ 1.516s] writing 'recovery'... OKAY [ 0.791s] erasing 'system'... OKAY [ 0.969s] sending 'system' (682924 KB)... OKAY [103.092s] writing 'system'... OKAY [ 46.568s] erasing 'userdata'... OKAY [ 8.677s] formatting 'userdata' partition... Creating filesystem with parameters: Size: 13725835264 Block size: 4096 Blocks per group: 32768 Inodes per group: 8144 Inode size: 256 Journal blocks: 32768 Label: Blocks: 3351034 Block groups: 103 Reserved block group size: 823 Created filesystem with 11/838832 inodes and 93654/3351034 blocks sending 'userdata' (137318 KB)... writing 'userdata'... OKAY [ 38.505s] erasing 'cache'... OKAY [ 0.613s] formatting 'cache' partition... Creating filesystem with parameters: Size: 734003200 Block size: 4096 Blocks per group: 32768 Inodes per group: 7472 Inode size: 256 Journal blocks: 2800 Label: Blocks: 179200 Block groups: 6 Reserved block group size: 47 Created filesystem with 11/44832 inodes and 5813/179200 blocks sending 'cache' (13348 KB)... writing 'cache'... OKAY [ 3.278s] rebooting... finished. total time: 207.000s root@ubuntu:~/Desktop/hammerhead-lpv81c#
注意：fastboot刷机界面很不友好，比如
fastboot -w update p_w_picpath-hammerhead-lpv81c.zip
这个命令执行过程，没有任何提示，并且时间很长，如果是初次刷机，有可能认为是刷机失败了
需要耐心等待一会儿
开机体验：
android L第一次开机速度奇慢，开机动画出现以后，等了大概5分钟，让笔者甚至怀疑是不是刷错
rom包了。在最后要放弃的时间，才出现了配置界面，发现rom包没有问题，估计是art模式转换的
时间太长了，但是好歹做个进度条提示，光一个开机动画转啊转，实在是让人很难忍受。
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