I have the Kindle 8.9 HD with the front-facing camera. I tried to flash CM 11, but now it's stuck at the bootscreen. It has the orange and white boot screen and a second later, a pixelated white bar pops up on the left, then it stays frozen until I shut it down. Windows doesn't seem to detect it at all, and I can't seem to get fastboot mode except for in Ubuntu using Soupkit. However, even if I do manage to get it into fastboot on Soupkit, SK says the device is offline afterwards even though the tablet displays fastboot on the screen.
It should be said and might be obvious, I'm not entirely sure what I'm doing. I spent a great deal of time reading into how to troubleshoot it myself. I do have previous experience with flashing roms on my Android phone, but that's about it.