I have a Nextel 7520 that I was trying to upgrade to the latest OS from Nextel. The upgrade process started, but now I have a 507 error on the screen and the BB won't do anything. I found this: How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ
and followed the steps, but if I take the battery out I can't run the utility and wipe the Blackberry. If I keep the batter in I can wipe the BB, run the Application Loader and start to load the OS, but during the install I get a check mark beside the updating radio and then it just sits there and never goes any futher. Any ideas? Thanks!!