Test Duplex Printing from Different Apps
- Try printing double-sided from different apps (e.g., Word, Safari, etc.) to rule out an issue with a specific application.
Printer Firmware Update
- Ensure your printer's firmware is up to date. Outdated firmware can sometimes disable certain features.
- Check for firmware updates via the HP Smart app or on the HP support website.
I hope this helps.
Take care and have a good day.
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Alden4
HP Support