In short you need the following:
Understand the above
1. Download one of the .img files attached below
2. Move .img file to your work directory. (Same location you would put any file you flash from fastboot)
3. Have phone connected and phone booted in to your android operating system with USB Debugging on in your system settings
4. Hold shift and right click a blank space inside the folder from step 2, click on "Open command window here" then type the following codes 1 by 1.
adb reboot bootloader
fastboot flash splash1 image.img