Can't flash recovery via fastboot - tf300t I have a asus tablet TF300T and I am trying to flash CM11 rom. I am following procedure from official CM pages http://wiki.cyanogenmod.org/w/Install_CM_for_tf300t, but I am stuck with flashing custom recovery (TWRP or CWM) using fastboot

I have switched to bootloader using


  adb -d reboot-bootloader


I see RCK, android and wipe data icons but no USB icon which should be the one which I need to choose.

I tried to load custom recovery by following commands:

$ fastboot erase recovery
erasing 'recovery'...
OKAY [  1.905s]
finished. total time: 1.909s

$ fastboot flash recovery openrecovery-twrp-2.8.3.0-tf300t.blob
sending 'recovery' (6838 KB)...
OKAY [  2.617s]
writing 'recovery'...
FAILED (remote: (InvalidState))
finished. total time: 5.049s


or 

$ fastboot flash recovery recovery-jb.img
sending 'recovery' (5644 KB)...
OKAY [  1.601s]
writing 'recovery'...
FAILED (remote: (InvalidState))
finished. total time: 4.488s


Tablet is running on 4.2.1 android with WW_epad-10.6.1.27.5-20130902 bootloader. It has been unlocked using official Unlock_v8.apk from asus pages.
Am I missing something? Is there any other way, how to flash own recovery?
I probably found the cause of this issue. It seems that device was not properly unlocked. Despite Unlocker_v8.log file which said that device has been unlocked it wasn't.

The unlock app v8 from official asus support pages did not work for me. I tried entire process (link is in my very first message) but tried unlocker v7 which is the second latest.

I passed password verification against my gmail account (it was blocked due to security reasons on gmail server) and device was properly unlocked. 

Calling 

fastboot flash recovery openrecovery-twrp-2.8.3.0-tf300t.blob


from fastboot mode was successful without any errors and the rest of procedure also.