A couple of days ago i was trying to upgrade the OS on my storm from OS4 to OS5. Since I don't have a data plan on my BB I couldn't do it the usual way through Desktop manager. Here's what I did and what happened:
I downloaded BBSAK 1.9 and OS5. Installed BBSAK and OS5. When I installed OS5, I was prompted for the PIN, since I didn't have it at the time I chose cancel. I ran BBSAK, chose "Backup Applications" then "connect" then "wipe device". As expected the Storm rebooted and came up with the "Reload Software 507" error.
I then selected "reconnect" in BBSAK, the prompt was "No device detected, push OK to continue".
I launched Desktop Manager, it said Disconnected. In DM the Installed Blackberry Device sotware is "v188.8.131.525 (Platform 184.108.40.206) for the Blackberry 9500 Smartphone".
I did a battery pull on the Storm, no change. Changed the USB port, no change.
I ran "C:\Program Files\Common Files\Research In Motion\AppLoader\loader.exe", it found the PIN, I went through the wizard, the "Device Application Selection" came up with the following check boxes grayed out and checked "Blackberry 5.0 Core Applications", "Browser", "Email Aplication Setup" and "Phone". when I click on "Next" a prompt comes up that says "The Email Aplication Setup cannot be loaded because some require files are not available".
I couldn't get any further than that.