1. Follow the download link for downloading Android 5.0 Lollipop ROM for your vivo X5 .
2. Now install completely the ROM Manager into your device. You can get that from Google Play store. Then install the clockwork mod recovery.
3. Connect the device to your PC by the USB cable. Now copy the ROM.zip file you have already downloaded into your memory drive.
4. Now restart your vivo X5 in recovery mode. You need to use ROM Manager for this operation.
5. Erase the total data including Delvik Cache from the recovery menu. After completing, come back in the recovery main menu. Then choose the Flash ROM from your memory drive. Now navigate the address where you put the ROM.zip file. It is the time when you need to follow the directions to install Android 5.0 Lollipop and to Update vivo X5 To 5.0 Lollipop. As early as the total installation is done, only reboot your vivo X5 .
Here you go now. All done!