- Printers
- Laser printer
49.DE.05
HP LaserJet M607–M612: 49.DE.05
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
High
Quick answer
HP identifies 49.DE.05 as: The control-panel WebKit encountered a fatal error, often while an installed software solution is being used. Do not guess a part yet. The observation that separates the next repair branch is the installed control-panel solution, action that triggers 49.DE.05 and firmware version.
Safety first
Stop and check this first
- Do not factory-reset, format storage or install unofficial firmware before preserving logs and configuration.
Safe checks you can perform
- Preserve the failure before clearing it
- Run one controlled, owner-safe discriminator
- Stop at the proved owner/service boundary
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measured service handoff for 49.DE.05
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measured service handoff for 49.DE.05
What they doCorrelate event log with job/solution timestamps, reproduce after isolating queues and accessories, verify the HP-approved FutureSmart bundle, and escalate with diagnostics before formatter replacement.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Preserve the failure before clearing it
Photograph 49.DE.05 and save the complete event-log suffix, printer model, firmware, tray, media, job and last intervention. A cleared panel is not a diagnosis.
Do not factory-reset, format storage or install unofficial firmware before preserving logs and configuration.
Evidence: HP LaserJet Enterprise M607 series troubleshooting · HP FutureSmart – 49.DE.05 WebKit fatal error
Run one controlled, owner-safe discriminator
Preserve the exact 49 suffix, triggering file/app/solution and firmware bundle. Remove only the triggering job from the queue, restart once, then retest without that job. Record the installed control-panel solution, action that triggers 49.DE.05 and firmware version; change only one variable before the retest.
Do not factory-reset, format storage or install unofficial firmware before preserving logs and configuration.
Evidence: HP LaserJet Enterprise M607 series troubleshooting · HP FutureSmart – 49.DE.05 WebKit fatal error
Stop at the proved owner/service boundary
One file/solution only points to the software path. A return while idle or across unrelated jobs on current HP-approved firmware points to printer service.
Do not factory-reset, format storage or install unofficial firmware before preserving logs and configuration.
Evidence: HP LaserJet Enterprise M607 series troubleshooting · HP FutureSmart – 49.DE.05 WebKit fatal error
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Printers
- Brand
- HP
- Product type
- Laser printer
Known code variants
- erreur LaserJet M607 49.DE.05
- error LaserJet M607 49.DE.05
- errore LaserJet M607 49.DE.05
- HP 49.DE.05
- HP LaserJet 49.DE.05
- LaserJet M607 49.DE.05
- LaserJet M607 Fehler 49.DE.05
What it means
Official meaning: The control-panel WebKit encountered a fatal error, often while an installed software solution is being used. Decision boundary: record the installed control-panel solution, action that triggers 49.DE.05 and firmware version. Service proof: Correlate event log with job/solution timestamps, reproduce after isolating queues and accessories, verify the HP-approved FutureSmart bundle, and escalate with diagnostics before formatter replacement.
Warnings and stop conditions
- Mediumsource verified
Do not factory-reset, format storage or install unofficial firmware before preserving logs and configuration.
Evidence: HP LaserJet Enterprise M607 series troubleshooting · HP FutureSmart – 49.DE.05 WebKit fatal error
Symptoms and causes
Probable causes · in order
- What the HP message establishesConfirmed
HP documentation for the LaserJet Enterprise M607–M612 family identifies 49.DE.05: The control-panel WebKit encountered a fatal error, often while an installed software solution is being used.
Evidence: HP LaserJet Enterprise M607 series troubleshooting · HP FutureSmart – 49.DE.05 WebKit fatal error
- The evidence that changes the repair branchPossible
Record the installed control-panel solution, action that triggers 49.DE.05 and firmware version. One file/solution only points to the software path. A return while idle or across unrelated jobs on current HP-approved firmware points to printer service.
Evidence: HP LaserJet Enterprise M607 series troubleshooting · HP FutureSmart – 49.DE.05 WebKit fatal error
Virtual technician
Does 49.DE.05 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
HP LaserJet Enterprise M607 series troubleshooting
HP Inc. · 2026 · official_doc
- 2
HP FutureSmart – 49.DE.05 WebKit fatal error
HP Inc. · 2026 · official_doc
Was this entry useful?