Hello

I have a BB 7130g with the following OS:

Pkg: 4.1.0.476, 4.1.0.351, Plt: 2.1.0.34

This is also the only OS available for my carrier at the blackberry site, but I have found that there's an upgrade avaliable for other carriers

Pkg:4.2.1.164 , 4.2.1.101, Plt:2.3.0.80

My question is. Is there a way to use this upgrade on my BB?
I have read some posts that talk about xml files where the vendors information is set but I was not able to find it.

I'm very new on this and I'll be glad if you can help me.

Thanks

Jorge