Ummm...what? You have an IPD or a BBB file on some external hard drive on your computer, but you can't get it onto your BB? What, exactly, did you try in order to accomplish that? The Desktop Software can restore to a BB from a backup file stored anywhere that the PC can see...if that external hard drive can be seen by your PC, then the Desktop Software can use it as the source of restore to the BB.
But, with so little information in this post, it's really hard to guess what might be helpful for you. I suspect maybe that you have other posts with other details, but piecing all of that together to try and come up with a coherent picture of your situation is pretty much impossible. You need to provide, within a thread that has all details of what may have "gone before", any new or additional details that will be helpful to understanding your situation, and therefrom hopefully providing you with useful guidance. But, from just this tiny bit of information, it's truly a WAG, not even a SWAG.
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
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