Sorry if this question is poorly worded, as I am new to MacOS. I bought this computer to be able to more easily work with my iphones at my shop. I have an iPhone 8 plus that is disabled, so I am trying to flash it with my Macbook 2011 running Catalina.
When I plug it in and boot into recovery mode, it offers to start downloading the update. I found a command to run in terminal to check the status, so I see that it does start.
My internet is slow, so it takes about 1-2 hours to fully download an IPSW file. The problem is this: as soon as the phone is disconnected, the download cancels itself. If i leave the phone plugged in, it reboots after 15 minutes and cancels the download (at around 800mb total). If i start the download then unplug the phone, it stops downloading as well. The update folder just goes empty all of a sudden.
What could be causing this? It is bad enough that there is no progress bar for itunes downloads, but they also silently cancel themselves. I do not want to have to manually download IPSW files for every iphone I service.
Any help solving this issue would be appreciated.