Fastboot permission denied error in Asus Zenfone 2 I went into regular recovery mode to wipe cache and do factory reset to flash clean Asus ROM from XDA. I first went to wipe cache and it felt like it was taking way too long, so I turned off the phone  and tried to turn it back on, and now all I get is a dead Android. 

I found this thread on XDA to unbrick the phone but when I try the steps I am getting permission denied message while using fastboot. I cannot flash TWRP via fastboot either. 

C:\Users\bdelc\Downloads\android\Fastboot&gt;fastboot flash recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (11864 KB)...
OKAY [  0.628s]
writing 'recovery'...
FAILED (remote: Permission denied)
finished. total time: 0.809s

C:\Users\bdelc\Downloads\android\Fastboot&gt;fastboot flash boot boot.img
target reported max download size of 536870912 bytes
sending 'boot' (11850 KB)...
OKAY [  0.619s]
writing 'boot'...
FAILED (remote: Permission denied)
finished. total time: 0.804s

C:\Users\bdelc\Downloads\android\Fastboot&gt;fastboot flash fastboot droidboot.img
target reported max download size of 536870912 bytes
sending 'fastboot' (14800 KB)...
OKAY [  0.712s]
writing 'fastboot'...
FAILED (remote: Permission denied)
finished. total time: 0.888s

C:\Users\bdelc\Downloads\android\Fastboot&gt;fastboot flash recovery twrp-2.8.7.1-fhd.img
target reported max download size of 536870912 bytes
sending 'recovery' (14456 KB)...
OKAY [  0.844s]
writing 'recovery'...
FAILED (remote: Permission denied)
finished. total time: 1.012s
Ok i was able to fix the problem. I was still able to load TWRP by flashboot, which I used to fix permissions and clear cache. The problem started because I went into normal recovery and went to wipe cache partition to load the SuperZen rom. The cache wipe seemed to take long, so I turned the phone off and back on and the only thing I was able to load was the fast boot. No recovery or normal mode worked, just ended up with a dead android. After fixing cache partition, I reloaded same 3 img files, kept getting permission denied error. Tried to get into recovery again and this time it worked! I used ADB sideload to flash the zip file above and it worked!