mobile

Hello, i own a xoom stingray tablet. I was trying to get cwm on my tablet and did a few things to it. But basicly in the end i messed up and wiped the whole tablet and now it has no OS at all. My recovery keeps saying i have no OS. I dont know what to do. I just need a way to get back to stock and not mess with my tablet again. I can still boot up into the boot logo and get into recovery and stuff. I have no SD card so that wont work. Someone please help?