I have fixed my problem, I don't know if it will help the OP. But here is what I did.
Downloaded ODIN plus the stock 3.2 honeycome odin file for my model p7500 (Unzip it too
). booted my tab holding power and vol down. Once the samsung logo comes up, release power.
Press Vol UP to select "Download Mode". Open ODIN, connect usb cable pc --> tablet and press volume up on tab again, to confirm download mode.
ODIN will recognize the tab, select the file you just unzipped, and click start... once finished you should be back to stock, so you can re-root. Like I had too
Now I just hope that my device is fixed and wont freeze anymore