I am having a problem and would like to back up my phone before doing ay upgrade on the OS. BUT my BBDM could never recognize my phone. it always 'disconnected' in the state and no device connected. this is what I try
1. I have tried to use dfferent USB
2. Update the USB driver, download it from the site
3. The device manager can recognize and i choose USBXXX(my device in the option) but it still remain to be disconnected.