تصویر سیستم Android 5.0 Lollipop را در Nexus 5 فلش کنید
This video will show you the necessary steps to flash the Android 5.0 Lollipop OFFICIAL system image on the Nexus 5. This is the exact same as if you were to accept the OTA update. Your bootloader must be unlocked and data will be wiped.
Downloads and commands:
http://qbking77.com/?p=3478
How to setup Android ADB and Fastboot:
https://www.youtube.com/watch?v=oaNM-lt_aHw
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FOR DEVICE NOT FOUND:
Install this: http://developer.android.com/sdk/win-usb.html
Enable developer options on phone, turn usb debugging on and plug into PC
If that doesn't work, install this driver: http://www.koushikdutta.com/post/universal-adb-driver