49.4C02LaserJet Pro M404n

HP LaserJet Pro M404n error 49.4C02: Firmware Fix

The HP LaserJet Pro M404n error 49.4C02 is a software exception signifying a communication failure between the system processor and the connected device. Users asking why does my printer show error 49.4C02 often find that clearing the print queue and updating the device firmware resolves the issue permanently.

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Common causes

  • 1Corrupted print job data.
  • 2Driver/Firmware synchronization mismatch.
  • 3Printer memory overflow.
  • 4Outdated firmware software.

Solutions

Quick Diagnosis

The error 49.4C02 usually appears during a print job. If the screen freezes or shows this code immediately on startup, it suggests an internal software crash.

Step-by-Step Solution

  1. Power cycle: Turn off the printer, unplug it, and disconnect the USB or network cable for 60 seconds.
  2. Clear print queue: Cancel all pending print jobs on your computer to remove corrupted data packets.
  3. Firmware update: Download and install the latest firmware from the official HP support site using a direct USB connection.

Prevention and Maintenance

Avoid overloading the memory by sending large or highly complex graphical PDFs. Keep your machine's firmware updated to benefit from the latest patches.

When to Call a Technician

If the printer displays this error even when disconnected from any computer, the internal formatter board might require hardware-level service.

Device Technical Specs

  • Technology: Monochrome Laser
  • Print speed: 40 ppm
  • Connectivity: USB 2.0, Gigabit Ethernet
  • Input capacity: 350 sheets (900 max)
  • Compatible consumables: HP 58A (CF258A) / 58X (CF258X) toner series
  • Recommended use: Small office / workgroup
  • Official drivers / firmware

Steps to follow

  1. 1

    Power cycle

    Turn off the printer, unplug it, and disconnect the USB or network cable for 60 seconds.

  2. 2

    Clear print queue

    Cancel all pending print jobs on your computer to remove corrupted data packets.

  3. 3

    Firmware update

    Download and install the latest firmware from the official HP support site using a direct USB connection.

Frequently asked questions

This error points to a firmware or processing conflict, usually triggered by corrupted print jobs or communication interruptions.

It is a common software exception that can usually be cleared with a restart, though persistent issues suggest a need for a firmware update.

This unit requires HP 58A or 58X series toner cartridges for standard operations.

Ensure your printer firmware is always up-to-date and avoid sending massive, complex documents that exceed the printer's buffer.

HP LaserJet Pro M404n error 49.4C02: Firmware Fix | Vimazdev