so..that mean i must wait for the 4.4.2 ATT anyway? and that motorola center can't do nothing about it?
to fix it yourself, you need to wait. Or you could do more harm than good.
A moto service center may fix it or send you a refurbished phone. And if they do, they might not cover it under warranty since you have a non-developer edition that you tried to flash the wrong rom too which put you in this situation. i.e. the warranty terms cover defects in materials and workmanship, not drops, getting wet, or other damage from improper operation or use. (flashing the rom for another model or carrier would be considered improper operation or use)... So it might cost $$$
If this is your only phone, and you need it working now, then you have no choice but to call Moto (if Moto Maker) or ATT (if retail non-customized) to see about "warranty" and see what happens. Otherwise use another phone temporarily and just wait for the ATT 4.4.2 SBF to leak, as you should be able to fix your phone by flashing it.