Help Messed up while rooting..

[godsobscure]

So I'm an avid rooter, and have rooted and messed around with loads of devices. (particularly, nexus) Well, I was rooting my nexus 9, about 3 weeks ago and everything went smooth. Today I noticed my device was reportedly no longer rooted, and I kept trying to reroot using WugFresh's NexusRootToolkit, Well I ****ed up.. It kept messing up so I decided I'd do a factory reset, and that did nothing. So I went into TWRP, and I did an advanced wipe and that other one you have to type 'yes' too.. and then I lost my OS, and even when I put it back to stock, even selecting "Bootlooped" absolutly nothing happens. Possibly need a new cable or something? Like all the commands worked, even while I was still trying to root, however nothing ever happened..

Edit: My device no longer has twrp on it. Also when I try to boot it up in any way it instantly goes to fastboot.. It doesn't even go to the boot screen

 

[lunatic59]

Looks like you did a complete wipe ... of everything including the bootloader/recovery.

You're most likely going to have to flash the factory images. You can find them (and instructions) here.