1. Open FB3
2. Let it connect to your phone, you'll get the green light on the bottom when your connected.
3. Click the "Read Data" tab
4. Select the "Generic for phones with boot ver. up to 07.D0" in the active profiles on the top.
5. Check the box next to pds.
6. Check the box that says "Cut empty bytes..."
7. Hit "Read data"
Now, once its finished making the backup, find it on your computer (see the settings tab in fb3 to see where it saved it to), it should be 64kb in size.