That doesn't sound right. That is, I never say Samsung use Odin3. I'd ask whoever sold this to fix or swap it back for a stock unit.
Samsung Tablet CE0168, Model GT-P7310MA
A few days ago, my tablet froze up during the start up. I tried to restart but got go nothing but a black screen. While plugged in, a download screen starts up saying download in progress and in the small print, it says "No Kernel". Also, in the small print, it says press "Start" for Odin3. I don't know what to press. The power button does nothing. Then after about a minute, the screen goes black again.