Big THANKS to Cmonex !
Download here: Mediafire
How to flash:
1. Extract the downloaded file to a folder on your PC
2. Connect X1 to PC as ACTIVESYNC
3. Run CustomRUU.exe and follow the instructions on your PC screen
4. X1 restart and done !
To verify if it successfully flashed: Turn off X1, go to Bootloader screen (Press Volume Down + Power), it should show SPL 0.78 Olinex