Try to go to Recovery mode. By pressing Power button + Vol down button at the start.
If you can go into recovery mode try to reset the tab.
Recovery mode doesnt open in this way.
What to do ?? I didnt installed any custom rom.
I used an app to change screen resolution and when it rebooted after changed resolution it didnt booted.
What you need to do is-
1. Get the USB drivers for your tab.
2. Install ADB - look around on google, you'll get it.
3. Connect USB and change directory to ADB folder.
4. type "adb reboot recovery" in the command prompt.
5. Do a factory data reset - you can do that once recovery mode boots up by the above command.
If it doesn't work, look for firmware and post if you find it.
I did it all u said.
When i type reboot recovery it just freezes on the android logo.
and how to know about firmware?
