Almost every finished product I've seen has a generic error message like that which makes it extremely frustrating when you're technical and actually want to attempt to fix the problem. I had the same issue with a WiFi connected Canon printer. As a dev myself, I know how difficult it can be to write a useful error message for every edge case, but it's not that difficult to be a bit helpful lol
Regarding users hatred of error messages: when I worked in my University's computer lab about 15 years ago a student complained that she couldn't download a file. I went with her to see what the issue was and had her show me what she was doing. She'd attempt to download the file, quickly dismiss a pop-up, and then angrily say "see?! It's not working!!". I told her to do it again, but not dismiss the pop-up so quickly so I could see what it said. Of course, it was asking for permission to save the file to the HDD and she kept clicking "no" 🤦♂️