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I read that your HP Sprocket prints blank pages. You have reset the printer and have updated the firmware and the issue persists. Fabulous analysis. Spectacular diagnosis of the issue before posting. Kudos to you for that.
The evidence points towards a hardware failure with the HP sprocket. I suggest you to contact our HP phone support to explore the hardware service options for your HP sprocket.
I hope this answers your question. Let me know if you have any further questions. All the best! 🙂