The file might be corrupted for some reason. I would recommend that you download the firmware again to your “local machine” (please avoid downloading the file to online storage). Then try it again. Also I strongly recommend that you upgrade it when your local machine is sitting in the same network as the Balance.
I have run into a customer that was trying to upgrade firmware in a Balance that was located in another country. This is not recommended.
If it’s not the file itself that’s causing it, please create a support ticket along with your diagnostic report from both Balance 710 and 380. Your cooperation would be much appreciated.
I was trying to upload it from a machine on the same switch as the Peplink.
Redownloaded the file a couple of times and still said the same.
I cant see V5.4.4 Firmware on your site or any of the change logs so it might be a build that wasnt for general release hence why the auto update feature isnt working either.
I have logged a support call and will see what comes out of that.