How to Flash via YGDP Tool
2. Download the driver from the LINK
Adb Driver LINK
3. Switch off your device. Press Volume Up button and connect to PC via USB cable. Don't release the Volume up key until the FASTBOOT MODE screen comes on your device.
4. Now type windows+X from keyboard and select device manager.
5. In device manager menu you'll find the connected Android device with ‘!’ mark as the driver not working.
6. Right click to update driver.
7. Click 'Browse my computer for driver software'
8. Click 'Let me pick from a list of device drivers on my computer'
9. Click 'Show All Devices'
10. Click 'Have Disk'
11. Click 'Browse'
12. Browse the location where you've extracted the driver and select the driver 'android_winusb'. Click 'Open'.
13. Click 'OK'
14. Select 'Android Bootloader Interface' and click 'Next'.
15. Click 'Yes'
16. Driver successfully installed. Click 'Close'.
17. You can see now the driver installed and the '!' has gone.
19. Select 'Developer' as User and click 'Login'.
19. Click 'Config'. Then browse the & select the ROM (.CPB file) which you want to flash.
20. Trick to save user data: Just untick 'Download User data' from 'Download Setting'. Click 'Apply'
21. Connect your phone via USB cable after press & hold the Volume up button till FASTBOOT MODE comes on the device screen. You can see a Yellow Cellcomes after detecting your device via YGDP Tool. Click 'Start'.
22. You'll get a Successful message after successful flashing the ROM. Close the YGDP Tool. Disconnect the device and boot. Voilà, you've successfully flashed the ROM.
CREDITS TO SKB aka SANDIP @ CPForums
READ ORIGINAL GUIDE HERE ; HERE