Flexi RIP Security Key Not Found — Sai Flexi RIP Tips (Part 10)
Symptom → Hypothesis → Inspection → Resolution
✅ Who should read this?
- Anyone seeing a “Security key not found” error when launching Flexi RIP
- Anyone whose USB Dongle (Lock key) is plugged in but not being recognized
- Anyone whose RIP program suddenly stopped working after a Windows update
- Anyone who needs to quickly determine whether the issue is with the machine or the PC
⚠️ Cautions
- This issue is almost always a PC or USB recognition problem — not a printer issue
- Repeatedly unplugging and reinserting the Lock key can worsen contact issues
- A SafeNet Sentinel driver conflict is also possible — check in order before assuming hardware failure
- Whether the LED light on the Dongle is on or off is the fastest first-step diagnostic
🧭 Key Summary (Field Checklist)
- Over 80% of “security key not found” errors are caused by a faulty USB port
- If the Lock key LED is off → try a different USB port first
- If the LED is on but still not recognized → likely a driver issue
- Many users assume it’s a machine problem — it’s almost always the PC
UV Printer — Knowledge Base · Troubleshooting · Printable Products
We have organized UV Printer related content as listed below. Click any item to navigate to the corresponding guide.
1) Ink Supply
23 articles covering ink supply issues including cleaning and pumping errors
2) Print Head Issues
12 articles covering everything from head replacement to head-related problems
For a deeper understanding of print heads: Printhead Basics — 9 Articles
3) Electronics / Software Issues
4) Mechanical Issues
5) Products You Can Make with a UV Printer
📋 Sai Rip Series — Full Article List
We are documenting Sai Rip related issues in order. This list will be updated as new articles are added.
10Flexi RIP Security Key Not Found — Dongle LED Off, Faulty USB Port Fix
In this article, we explain what to do when you see the error message: “Security key not found.”
I. The Problem — Flexi RIP Security Key Not Found
A call from a customer
A shop owner contacted us saying that Sai Flexi RIP had been working perfectly until last week — but suddenly stopped working that morning.
- The RIP Lock key was still plugged into the PC as usual.
- The customer had recently purchased our printer after using a competitor’s machine, and had carefully tuned the color adjustment graph to match their existing product colors. They were understandably worried that all those settings might be lost.
- For reference, fine color adjustment in Sai Flexi RIP is covered here: Can Flexi RIP Match Japanese Printer Colors on a Chinese Machine?
The customer’s voice was heavy when we first spoke.
“I’ve restarted the computer and the machine several times… nothing works. I’m at a loss.”
“This is a RIP software issue — it has nothing to do with the printer itself. All RIP software is registered online, and without the security key, it simply won’t run.”
“The USB Lock key you gave me is still plugged in. I don’t know what to do.”
II. Solution — Flexi RIP Security Key Not Found
The customer sent us a photo of the PC with the Lock key plugged in.
- As shown in the red dotted box, the Sai Flexi RIP Lock key is visible.
- Under normal operation, the LED on the Dongle should be blinking — but in this case, there was no light at all.
- A Windows update can sometimes cause this. If that’s the case, refer to this article: (Sai Rip Dongle USB Not Recognized — SafeNet Sentinel Driver Conflict Fix After Windows Update)
- The Lock key itself may also be physically damaged.
- Or the USB port on the computer may have failed.
“Could you try plugging the Lock key into a different USB port and check whether the LED comes on?”
“Oh — the light is blinking now. It’s on!”
“Great. Now try launching the RIP software again.”
“It’s working now!”
The root cause was a failed USB port on the PC where the Lock key had been plugged in. Switching to a different USB port resolved the issue immediately.
III. ARTJET UV Printer
Having sold and serviced ARTJET UV printers for over five years, the most important lesson we’ve learned is this:
After product reliability, the most critical factor is accumulating troubleshooting data.
Any machine can develop problems depending on the environment, workload, and operator experience. What matters most in a real production setting is not “a machine that never breaks down,” but rather:
How quickly and accurately you can identify the cause and resolve the issue when something goes wrong.
ARTJET continuously collects and organizes real-world field data to support faster and more accurate problem resolution.
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💰 ARTJET Pricing & Sales Conditions
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🧾 Complete List of UV Printable Products
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※ This article is based on real field cases. Results may vary depending on your environment and machine configuration.