No room may indicate the camera is set up to store pictures on the SD card. Or it can mean that the main file system is corrupt. That should be easy to find out. There are many cures for a corrupt file system; most of them involving the USB port (that you don't have) but some not.

If you manage to get your new toy online, there may be some chance even without reflashing. That way you can live without the USB port, provided you can charge the battery elsewhere. I know of a few people here who use it like that, one even replied in this thread. I myself use the USB port only for charging, everything else can be done y WiFi or Bluetooth.

Then your only remaining problem is the display. That is not that difficult, although I have been lucky with mine and never had to use the cheap Chinese ones from eBay and cannot vouch for their quality.