Default [Q] Looking for bootloader for GT-9082 XXAMA9 Australia

A while ago I rooted a Samsung Galaxy Grand Duos (GT-I9082) and installed the CWM touch bootloader. I intended to install Cyanogen Mod on it, but couldn't find the right radio, so I kept the stock firmware.

Now I have a potential warranty issue, so I'd like to try to revert everything. Since it's still running stock, I only need to remove CWM.

I found @bhsiddharth's guide to unrooting, but of course I need to get hold of the original bootloader.

The phone reports that its baseband version is I9082XXAMA9, and I'm in Australia. I haven't been able to find this bootloader anywhere, including these forums.

Can anyone point me in the right direction to find it?

More information: *#1234# shows:

AP: I9082XXAMAE
CP: I9082XXAMA9
CSC: I9082OJVMA2