This may be because you have too many pictures, waveforms, etc. saved in your machine. As a result, the storage of the machine itself is not enough, so you need to delete some content and you can upgrade.
Current version is 1.0.1.1.0 (20210726.00) I downloaded update dso3kb_20220210.upk Tried 3 usb drives 3g to 32 g formatted in fat32. Keep getting error code -4