[Q] XT925 network unlock without code

Hi all,
I retrieved a pre-commercial Motorola RAZR HD XT925 simlocked on a french operator.
I want to use it on another french operator, but I get the message "unlock network code" after I enter my SIM PIN.

I tried to get the unlock code from the operator but it doesn't exist in their database since it's a "development" device.
Also tried to buy the unlock service on internet : device not found on Motorola unlock server, either on their specific "not found" server.
Also contacted Motorola without anybody able to find this code.

After searching for days on different forums, i'm running out of ideas.
I'm trying to know if there is any way to get rid of this code asked.
I read a thread on NV_data but I'm not sure if it can be applied on this phone.
http://xdaforums.com/showthread.php?t=2166542

I unlocked already the bootloader just in case, flashed an official signed French retail ROM on Jelly Bean.

Any clue or help would be really appreciated.

Thanks for the tip.
After buying unlock codes on many different sites and ebay, one site could succeed in finding a working code : unlockphonenetwork.
I guess they had somehow generic codes working for this particular device.
Issue solved, thanks.