N73 product code affects unlocking?

Neopolar

New member
I have a Three Australia N73 which I updated to the ME firmware using the NSS method everyone knows. I called up Three today to get my free unlock code, which I just realised I could do, but the code doesn't work.

After some googling this seems to be because of the product code change. If I enter the unlock code I get "code error". If I change the product code back to the original, I get a "not available" error.

From what I've seen its not easy at all to downgrade the firmware which is something I'd also like to do

Anyone know what's going on here?
 
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