In the same boat. Tablet started acting funny last night. Deleted a bunch of apps, but left the icons.
Figured I would do a restore from a previous backup. That failed and now the tablet wouldn't boot.
So I downloaded Kies3, tells me that my tablet model is not supported. Tried earlier Kies, hangs on connection.
So I downloaded the latest firmware for my tablet from Sammobile to try and flash in Odin.
Flashes successully, however does not boot after. It has been stuck on the Samsung logo for an hour.