If you got a "code" from AT&T, it is a SIM-UNLOCK (so you can use it on another carrier).
It has absolutely nothing to do with the bootloader. AT&T does not give out bootloader unlock codes, and won't allow Motorola to give it to you either. You can beg/ask AT&T/Moto as much as you want, but its not going to happen...
Your only hope of unlocking BL is to get with the China middleman when he starts business back up. See that thread "China Middleman Back" for more info.
Good Luck.
Oh I see, well, time to throw this phone away and go with another carrier I guess Thanks for the scoop on AT&T
Oh I see, well, time to throw this phone away and go with another carrier I guess Thanks for the scoop on AT&T
Maybe this. Although probably won't work on the AT&T model, as already stated.
https://motorola-global-portal.custhelp.com/app/standalone/bootloader/unlock-your-device-a