I think you can use an external hard disk

Yes, sometimes iTunes doesn’t work. You can try some other tools. As far as I’m concerned, Apowersoft Phone Manager is an app that can be used to manage files and delete photos by connecting your iPhone to PC through USB cable or WIFI connection. It’s easy to operate, and you can view your photo albums, select the photos, and delete them with a click.

A blackberry phone? Maybe you can try to shut it down and then turn it on mins later.