How do I print from a USB flash drive?
To print from a USB flash drive, you must first enable the USB port for printing via the printer settings. The printer has an easy-access USB port on the front designed for printing and scanning without a computer. Once enabled, you can insert the USB drive and select the documents to print. (Page 46-47)
From the official HP Color Laserjet Managed E45028 manual, page 47
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