1. 下载http://bigota.d.miui.com/tools/miui_ns.zip
2. 下载
http://android.clients.google.com/packages/ota/google_crespo/VQ8PQk_V.zip
并拷贝到sdcard根目录下
3. 关机,然后电源+音量上键启动到bootloader
4. 点击miui_ns下的fastboot/flash_recovery.bat刷recovery
5. double wipe
6. install 1ada25375426.signed-soju-ota-189904.1ada2537.zip,接着install google_crespo/VQ8PQk_V.zip
7. install Superuser-3.0.7_mod_CN.zip
8. 重启系统