Cant upgrade to 6.0. Is my device bricked?

[maximegousse]

I believe that I am in big doodoo. I have attempted (and failed) to install Marshmallow on my Nexus 9. Unlocked the bootloader ok. Downloaded ADB 1.0.29 and FASTBOOT (not sure I got the latest versions). It failed to install system.img and now when I reboot all I get is the Google logo. Tried a factory reset. Nope. Arrrrgggg. Am I bricked?