After Long time of research i found the way to restore our bricked iball slide 6318i.
By this method you can easily restore and reflash stock rom to your slide.
First you have to download this files...
1. Flash Tool - DOWNLOAD
2. ROM image/ Update Image - DOWNLOAD
3. Drivers - DOWNLOAD drivers
Now you are ready...
First thing...you slide should have battery about 40%....
1. Run that flash tool
2. unzip the ROM image update.img
3. load this image into Tool.
4. Now take you iball slide 6318i and press Volume down + power button together. and connect with USB.
5. Now right click on my computer icon and click on Manage and then Device manager and you will see one unknown usb device with yellow mark. now right click on it and update driver. Select drivers manually from your computer and select those you downloaded above. After installing these drivers your PC will detect an device something like rk29xxx bla bla bla.....
now you are ready to flash your stock rom.
6. Now you will see green Square in device list in tool..Means your device is ready.
7. Now Hit upgrade
8. DON'T do anything with your iball slide 6318i and PC till then flash process is going on..
your tablet will restart and will see some green android sign...Don't get panic Your Device's android is preparing itself..Now your device may restart servel time or maybe you will done in single try..
you just reinstall your Iball slide 6318i..
Now Do experiment with your iball slide 6318i and develop some crispy ROM for our iball slide 6318i..
NOTE:-- This Method is tested by myself and safe but you may brick your slide if not done proper..Try this at your OWN risk...Happy Flashing