Default Trying to install bootloader/ROM/kernel on Ouya, need assistance...

So, a friend brought his Ouya over and asked me to root it and install a new kernel on it, telling me the one(s) he wanted was this:

My problem is, when installing the bootloader it seems the one that was downloaded was *not* the one with fastboot in it, which was my mistake. I need to install the newer version with fastboot in order to install the kernel (as far as I understand, as I've always flashed kernels in fastboot), but now when I type su in adb shell, it returns, "/sbin/sh: su not found." The Ouya starts into the bootloader and then recovery just fine, but I can't get it to do anything else at this moment.

I know I did something wrong, but how did I remove superuser access? I know I had it, because I was able to install the bootloader using the dd command. How can I fix this, if someone would be so kind as to assist?