What does error code *64 on the control panel mean?

Error code *64 indicates low memory in the system firmware and suggests checking available space for updates or clearing temporary files. (Page 23)

From the official HP Laserjet Pro M1213nf M1219nf Multifunction Printer manual, page 196

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How do I fix low memory error on my HP LaserJet printer?
Error code *64 indicates low memory in the system firmware and suggests checking available space for updates or clearing temporary files. (Page 23)
Why is my HP printer showing memory issues?
Error code *64 indicates low memory in the system firmware and suggests checking available space for updates or clearing temporary files. (Page 23)
What should I do when my printer displays a firmware memory error?
Error code *64 indicates low memory in the system firmware and suggests checking available space for updates or clearing temporary files. (Page 23)

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