Preparation for flash Android Original image for Nexus 5:
1) Hardware:
A Nexus 5 phone & an well connected USB cable;
2) Software: (through VPN)
1> SDK Platform Tools from 'SDK Platform Tools' ;
2> Android images between Factory Images & Full OTA Images;

一、进入 Recovery Mode 的两种方式：

1、硬键启动：关机、同时按下电源键、音量上键、音量下键;
音量键上下选择，电源键选中确定；进入后，见到病倒小机器人，press Power Button + Volume UP.。
2、软件启动（ADB命令行）：
1>Connect your phone to your PC through the USB cable;
2>adb devices;
adb reboot bootloader;
adb reboot recovery;
When a small Android appears, press Power Button + Volume UP;
Choose Apply update from ADB;
adb sideload OTA_UPDATE_FILENAME.zip
PS:

参考文献：
[1] 丰生强. Android软件安全与逆向分析. 人民邮电出版社. 2013.
[2] https://www.youtube.com/watch?v=rdSWCD8IwVE
[3] Bruce Eckel. Thinking in Java. Prentice Hall. 2006.
[4] https://forum.xda-developers.com/google-nexus-5/general/tutorial-how-to-flash-factory-image-t2513701
[5] https://www.howtogeek.com/205535/how-to-install-android-updates-for-your-nexus-devices-without-waiting/

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