My Galaxy Tab 2 7.0 keeps rebooting until the battery dies. I can't restore or update, what I do?

[AC Question]

my galaxy tab 2 7.0 keep rebooting until the batterydead. I can't restore or update, what I do?

I tried to up date but I restart with pwr. key and vol. key it says custom binary down load: no. model GT-P3100