[Q] Firmware update failed and failed recovery with Kies topic

Hello,
I have a problem.
I used my Samsung Galaxy GT-P6800 until yesterday.
Yesterday I downloaded the latest version of kies and I installed it.
When I plugged my tablet to the program kies, this told me that there was an update available. So I accepted the upgrade.
Unfortunately not been successful upgrade. So I tried to make the recovery of the old firmware. I receveid again an error. Kies tells me to call the service center.
Now I am a tablet that does not turn on and that only goes in odin mode by holding down the power button plus the volume down button.
It should not be in recovery mode because if I try to press the power button for 10 seconds nothing happens.
How could I resolve the problem?

My tablet is not rooted.

I don't know what is the problem because doesn't compare the code error.
I do not know if it depends on the driver. I do not know if it depends on something else.
But I would like to re-use my tablet. Help me, please.