Thank you, Austin. I thought the USB port was OK just because it was charging! With a few wiggles of the cable, I could mount the internal and SD card storage. I'll check the connector and its soldering when I replace the battery. I have a way forward! Cheers!

My DP-X1A running 5.1.1 has been offline for over a year awaiting a new battery. Now that the battery has arrived, but before I installed it, the X1A no longer allows any of my PCs (2 x Win 10 and 1 x Mac) to access its built-in or SD card storage. The Settings->Storage->USB computer connection...