1. SD Card (It will be formatted, Please backup your data)
2. SD Card Reader
3. Your PC
4. Your Tablet
5. Data Cable

Procedure

1. Download this two zip files.

Flash tool umedia tablet zip

LAVA Z7H S005 20120829 withoutcontent img

4shared Link LAVA Z7H S005 20120829 withoutcontent img

2. Extract the "Flash tool umedia tablet.zip".

3. Open the "PhoenixCard.exe".

4. Click on "Image File" & browse to where you have downloaded the image file "LAVA_Z7H_S005_20120829_withoutcontent.img".

5. Insert your sd card to the card reader & insert in the usb port of your PC.

6. Click on "Format to Normal", then click Burn.

7. After finished the above step completely remove the SD Card from card reader & insert it in your tablet. Make sure the tablet is off. Then power on it.
OR
Insert a small pin in the reset hole.

8. Now you can see a red progress bar moving. After it is completed the tablet will be switched off.

9. Now remove the SD Card and Turn on you tablet.