Unlock not working (ADB FLASH)
It seems you are getting an error on the fastboot oem unlock step. If you don't get the bootloader unlocked, then you might as well forget the remaining steps.

To make sure the device is actually in the right mode, I recommend putting it in the bootloader manually.  The easiest way to do that is to first turn the phone off. Now hold the volume-up and volume-down buttons, and then press the power button.You'll now see the Android roboto with his front panel open. Check to see that the text below it starts with "FASTBOOT MODE" in red. At the bottom of the screen you may also see the lock/unlock status.  Now plug the device into your computer and try the unlock command. If you have a bootloader that shows the lock/unlock status on the device screen, it should change right away. Once you're unlocked, you can proceed with the flash commands.  If you get past the unlocking and still have problems, come back with a new question.