I first got a 7100g. Used BBM and other stuff on it. Then I switched to the 8100; all settings got transferred. But then I had some trouble with the 8100, so I switched back to the 7100g, but I realised that my BBM contacts didn't get transferred. Turns out that the 8100's BBM version is higher than the 7100g's version, so I couldn't get over any contacts.
Is there a way to switch and transfer new BBM contacts back to the old one?