Re: Blackberry 8520 Unlocked *OS Update
1 - You must use the OS installer file released for your model. Did you?
2 - You must execute the installer file on the computer.
3 - A data plan is required to install OS 5. There are work arounds but I don't recall exactly; however, you should be able to find with not too much searching, and it is discussed on the forum in at least one or two threads but probably more.
4 - If you aren't really have trouble with what you have, there's a good argument to be made for leaving it alone and sticking with it.
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