Wirelessly posted (BB 8860: BlackBerry8100/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100 UP.Browser/220.127.116.11 UP.Link/18.104.22.168)
You are SO over analyzing this.
Wipe the device.
Install the OS to the pc.
Plug in BB to the pc and open DM and run Application Loader. When its done loading the OS to the device then restore the backup.