ok , this link offers details on reloading the type of BB you have and using Desktop Manager.
I used it to reload a 9810 a few days ago to see if it is accurate and caused any issues. It did take a long time and I thought it was stuck but finally did load and reboot.
I also did a wipe on a Z10 and the reload took over 1 hour and a boot took 37 minutes. subsequent reboots took 3 to 4 minutes.
Give this a read and see if it helps.
KB03621-How to reload BlackBerry Device software and applications using BlackBerry Desktop Software