Disclaimer: I am not responsible for bricked devices, dead SD cards, etc!
Warning: I didn't test this procedure, I did backup the images from stock Chinese version before installing global version but I didn't flash it back. Please test at your own risks!
1. Make sure your bootloader is unlocked
2. Download the images provided in the link below
3. Boot your device to recovery (hold volume up and power until reboot)
4. Wipe data
5. Boot your device to bootloader (hold volume down and power until reboot)
6. Connect your device to PC (make sure you have installed fastboot on your PC)
7. From windows command prompt cd into the folder containing the images
8. Run the following commands to flash all images