I was searching the forum for a similar problem as mine.
And you have the exact same problem as I do.
At some point when I used Odin 3.07 and flashing an official firmware from samsung I got past the first boot screen.
But right after that it shows an android robot with a dedacahedron in front of it showing an animation and a loading bar.
Soon I discovered the next loop, since this animation would loop over and over again.
Now I waited for the battery to run out and charge it up till its full.
By the way:
When the tablet is off and I plug it in with the original cable and charger the tablet shows the battery icon, but it doesnt show the charging animation. The battery icon shows a "waiting" circle. So I cant really see if its charging or not.
Have you had any progress?
Would be so awesome to fix this, this galaxy tab is not mine. Its my brothers and I broke it by trying to root it and install cwm xD