Unable to install rom

[commando0]

i have touch dual from orange

its unlocked

but i am unable to install original rom on my device
while installing it says invalid product code

so how can i change my device product code so that it can intall original rom non orange rom on my device

 

[commando0]

Problem solved by following thread
http://forum.xda-developers.com/showthread.php?t=355730