A few days ago I heard about MTS Mobility releasing OS 4.5.0.56 for the 8130 & 8330 but the links did not work when you tried to download it. Frank just checked today and the links now work. This is not the latest OS for either of these devices but if you are one who loves to take the official route then this is currently your best bet.
You can pick up the downloads at this link:
https://www.blackberry.com/Downloads/entry.do?code=A928731E103DFC64C0027FA84709689E
via PinStack & CrackBerry (Pulled post)
