https://wiki.mozilla.org/B2G/QA/Tips_And_Tricks#Hardware_Cheat_codes
FYI, Inari refers to the ZTE Open.

Doing the vol down+up + power should put you in fastboot mode.
This means that the "fastboot" should be able to see the device. ie:
fastboot devices

If that is the case, then you can flash partition images onto the phone using fastboot. This is what the flash.sh script does. It puts the device in fastboot mode and then flashes the images per fastboot.

Chances if you are in fastboot mode then the boot.img that they pointed you to worked. The problem is described by Eduardo on a separate thread: http://sl.edujose.org/2013/10/adapted-boot-image-for-use-with-b2g.html

Once you place the boot.img in the proper location, give flash.sh another go. If that still doesn't work please let me know. The other thing we could potentially do is flash just gecko/gaia on the device provided that you can reboot the device and have adb access. This is done by :
<project folder>/flash.sh gecko
<project folder>/gaia/make reset-gaia

Regards,
Naoki

On 10/15/13 10:29 AM, daniel.i...@googlemail.com wrote:
Michael: Thank you but, it took around 15 e-mails and over two weeks mailing 
around with the eBay seller until they actually understood my problem. They 
kept pointing me to the download already discussed in this thread over and over 
again, and I had the impression that I was talking to a wall. As explained, 
when they finally realized the actual problem they offered me a new phone for 
80% of the initial price (which is a 20% discount).

Again, I am not willing to throw an almost completely new phone (never carried 
around, no scratches, screen cover not removed yet etc.) in the trash can and 
buy a (discounted) new one just because the firmware is bricked and ZTE refuses 
to reflash it. This is the complete opposite of what I was expecting from a 
device marketed as developer phone - not mentioning that it's completely crazy 
when looking at it from an ecologic perspective.

Vinayak: Well, this is as similar to my situation, I assume you can also access 
see the device over USB being in diagnostic mode when you boot it by holding 
both voldown+volup + power although the screen remains black?
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