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- HP Community
- Printers
- Printer Setup, Software & Drivers
- SERIEL NUMBER ERROR

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08-13-2026 09:19 AM
Hello @DebH52, Welcome to the HP Support Community.
Thank you for posting in the HP Community.
If you are receiving a "Serial Number Not Valid" message for your HP Officejet Pro 9730e, please verify that you are entering the printer serial number (S/N) and not the product number, model number, MAC address, or another identifier from the printer label.
Please check the following:
Locate the serial number on the printer label, typically found:
- On the back of the printer.
- Inside the cartridge access area.
- On the printer information label.
Enter the serial number exactly as shown:
- Do not include spaces.
- Be careful to distinguish similar characters, such as:
- 0 (zero) and O (letter O)
- 1 (one) and I (letter I)
If you are entering the serial number into HP Smart or an HP website, try copying it directly from:
- A Printer Status Report, or
- The printer's Embedded Web Server (if accessible).
If the serial number on the printer label continues to be rejected, please send us a private message Private Messages - HP Support Community with:
- A clear photo of the printer's serial number label.
- A screenshot of the error message.
- Please let us know what are you looking for with the serial number so that we can assist you further?
Have a great day!
I'm an HP Employee.
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