ZTE A66 (Why can't I no longer unlock it with infinity box)
 

Pls help me out. I was able to unlock one ZTE A66 earlier this morning. But while trying to unlock the others, below is the message coming out:
COM7 selected
module v1.73
Device: ZTE-A66 820013
Checking data, wait...
Action: "sp-unlock"
unlock method-1
Boot ...
Press and HOLD Power button now !
e-gold: 820013
loading...
error: can't run preloader: 01
middle part...
error: can't run middle loader:
Finished, time used: 8 sec
Remove/Install battery now !

I tried to reunlock the first one I unlocked, this message still repeated itself.
COM7 selected
module v1.73
Device: ZTE-A66 820013
Checking data, wait...
Action: "sp-unlock"
unlock method-1
Boot ...
Press and HOLD Power button now !
e-gold: 820013
loading...
error: can't run preloader: 01
middle part...
error: can't run middle loader:
Finished, time used: 8 sec
Remove/Install battery now !


Pls what can I do!

New types of these phones exist on marked now, this new CPU type is not supported yet.