Hello all. I'm a Spanish user and last December I bought a Nokia Lumia 920 with Amber version (the phone was free, new and sealed). I had the same problem as you with the photos: the photos had a yellowish color mostly. I searched how to downgrade to Portico version and I'm very happy with the change. I can't be happier now.
I don't have any photos of Black/Amber update: for yellowish photos you can see some pictures on this forum. But here are two pictures with my new Portico firmware.
There's no yellowish tint.
I don't have any photos of Black/Amber update: for yellowish photos you can see some pictures on this forum. But here are two pictures with my new Portico firmware.
There's no yellowish tint.
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