You need drivers for operating any printer. Similarly to use the HP printer 6978, you need drivers. You can download a driver setup file by checking out 123.hp.com/setup 6978. If you’re not able to see any download button, then there is an alternative. There is another trick. You need to enter the model number HP printer 6978 in the search box. It will display the driver files. Download the driver's files either from the link or by clicking on the download button. Once downloaded, you can install the files.
Once your printer is connected to your wireless router, you can download the printer drivers from 123.hp.com/setup 6978. Install the compatible drivers on your device and restart the computer to be able to print from your printer successfully.