system crashed pls help - Nexus 9 Q&A, Help & Troubleshooting

hey guys
I do some wrong
I try to factory reset on my n9 and after this everthing goes wrong
my bootloader is locked and I can't unlock it
if I try I get (bootloader) Permission denied for this command!
and my n9 stuck in a bootloop
c:\android-sdk-windows\platform-tools>fastboot oem unlock
< waiting for device >
...
(bootloader) ability is 0
(bootloader) Permission denied for this command!
OKAY [ -0.000s]
finished. total time: -0.000s
Checking Bootloader Lock State + Tamper Flag:
---------------------------------------------
...
(bootloader) [ERR] Command error !!!
OKAY [ 0.006s]
finished. total time: 0.007s
Click to expand...
Click to collapse
I try to flash the bootloader from bootloader-flounder-3.43.0.0114.img and this dont work after this I try to flash the bootloader
bootloader-hammerhead-hhz12d.img but this also not work -.-
now I have no system on my n9 no recovery on it
someone has a idea what I can do?

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In fastboot try,
fastboot format cache
fastboot format userdata
Sent from my Nexus 9 using XDA Free mobile app

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fastboot format cache I get this
Code:
C:\WINDOWS\system32>fastboot format cache
Creating filesystem with parameters:
Size: 268435456
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 1024
Label:
Blocks: 65536
Block groups: 2
Reserved block group size: 15
Created filesystem with 11/16384 inodes and 2089/65536 blocks
target reported max download size of 518205818 bytes
erasing 'cache'...
(bootloader) Device State : Locked
FAILED (remote: Can not erase any partition while device state is locked!)
finished. total time: 0.157s
and by fastboot format userdata
Code:
C:\WINDOWS\system32>fastboot format userdata
Formatting is not supported for filesystem with type 'f2fs'.

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Try holding the volume down button, booting into Fastboot, then running WugFresh Nexus Root Toolkit http://forum.xda-developers.com/nexus-9/development/toolkit-wugs-nexus-root-toolkit-v1-9-8-t2945451 with 'Flash Stock/Unroot' and 'Soft-bricked/bootload'' option then in the next window '5.0.2 Android' and 'Force Flash Mode'
Can't promise it'll work but worth a try.

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@kedarrWolf I tryed your way but it dosn'T work
Code:
target reported max download size of 518205818 bytes
erasing 'system'...
(bootloader) Device State : Locked
FAILED (remote: Can not erase any partition while device state is locked!)
finished. total time: 0.141s
rebooting into bootloader...
OKAY [ 0.016s]
finished. total time: 0.016s