Printing Errors or Lights & Stuck Print Jobs

I bought this refurbished printer off of ebay about a year ago. The print quality has always been garbage with fuzzy text and weird shadows around the text, however at first it did print most things acceptably. I haven't printed in a while and just tried to print a mailing label and the text came out very weird - all of the font was "outline" instead of solid (as it appears in the PDF), and instead of black everything was a light green, and some text didn't show up at all. Now when I try to print anything, it won't print black at all, and only prints certain colors in a very faded way. The cartridge levels for both color and black are slightly less than half full. I have run "align printheads" and "clean cartridge" tools several times and they don't help. I don't think putting in new cartridges would help, because with the weird "outline text" issue it seems to be a software issue, not a cartridge issue.

Anyway I would like to reset the printer to factory settings. However, I have tried to do this several times through the HP Smart app and it always fails. Before I start doing it, it tells me to go to the printer's IP address in a browser window and I do. I start the Restore Factory Defaults process, and it goes for about 5 minutes, then I get an error message that the Wi-Fi connection to the printer has been lost. The browser window with the printer's IP address also doesn't load anymore. After this, the printer isn't connected to my Wi-Fi network anymore and I have to go through a very tedious process to setup the printer from scratch. Note, I don't have the USB cable that came with the printer, and it doesn't have an ethernet port, so Wi-Fi is the only way the printer can connect to a network.

Is there any way to complete the Restore Factory Defaults process without the Wi-Fi connection dropping or should I just throw this POS in the dumpster?