Hi @Judderdude, Welcome to HP Support Community.
Thank you for posting your query, I will be glad to help you.
To restore the printer to the original factory defaults
1. From the printer control panel, touch or swipe down the tab at the top of the screen to open the Dashboard, and then touch ( Setup ).
2. Touch Printer Maintenance .
3. Touch Restore.
4. Touch Restore Factory Defaults. A message appears stating that the factory defaults will be restored.
5. Touch Continue.
You may refer to this document - h10032.www1.hp.com/ctg/Manual/c05633496.pdf
I hope this helps.
Take care and have a good day.
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Max3Aj
HP Support