If you need specific instructions on how to use the official WIC utility for your printer, I can guide you through that process safely.
Because the printer has no hardware sensor to measure actual liquid saturation, it uses a digital counter to estimate when the pads are full. Once this digital threshold hits 100%, the machine enters a protective lock state to prevent raw ink from leaking onto your workspace. Key Capabilities of the L6490 Utility
Use trusted sources, keep a known-clean backup of the software, and seriously consider installing an external waste ink tank to manage the physical waste, not just the digital counter.