I have possibly good news for us chinese N9 owners. I am still very guarded with my comment, but it looks promising.
In answer to your question, yes I used the main.bin from the sim tray. in my case was a 003 aka chinese version. I would recommend you try what i did. I also tried nemesis, but had no luck. yes i was able to change product code, but thats it. afterwards i still was unable to flash(using phoenix, i never tried winflasher w/new product code).
my code looked something like this flasher>flasher -F nameofyourold.bin --flash-only=cmt -f
note that i did this after doing a full reflash with in my case a 009 main and emmc.bin files. I recvd the sim card error and after doing the cmt flash, it was gone. on my first flash, i also had a "unable to use camera while connected to pc msg" that is gone now!! fixed?
I am also downloading new maps, also a previous problem. I would give it a try, though you may need to change your product code back in nemesis to prevent other errors???
stay tuned I will report back on how my N9 is fairing!