Stuck in bootloop, can't flash

Posted in the general thread, but no replies.
I seem to have softbricked my phone by rooting then applying the OTA update. I've tried re-rooting, wiping cache, factory resetting, etc., and nothing seems to work. Following the steps in http://forum.xda-developers.com/zenf...d-zf2-t3127835 I can get to step 7, but when I submit any of the commands I get this:

Code:

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C:\Users\Elliott\Downloads\CWM_Zenfone_2_Intel>fastboot flash fastboot droidboot.img
target reported max download size of 536870912 bytes
sending 'fastboot' (14822 KB)...
OKAY [  0.666s]
writing 'fastboot'...
FAILED (remote: Permission denied
)
finished. total time: 0.839s

C:\Users\Elliott\Downloads\CWM_Zenfone_2_Intel>fastboot flash recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (11882 KB)...
OKAY [  0.545s]
writing 'recovery'...
FAILED (remote: Permission denied
)
finished. total time: 0.716s

C:\Users\Elliott\Downloads\CWM_Zenfone_2_Intel>fastboot flash boot boot.img
target reported max download size of 536870912 bytes
sending 'boot' (11868 KB)...
OKAY [  0.522s]
writing 'boot'...
FAILED (remote: Permission denied
)
finished. total time: 0.694s

C:\Users\Elliott\Downloads\CWM_Zenfone_2_Intel>fastboot flash system system.img
target reported max download size of 536870912 bytes
erasing 'system'...
FAILED (remote: Permission denied)
finished. total time: 125.564s

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It wasn't clear if it was a windows permission error or an android permission error, so I tried an admin command prompt but that didn't change anything.
Any suggestions? Thanks in advance