Chipless Printers
Why Use Epson SX420W Firmware Key
– Epson SX420W downgrade firmware key: this is required when NON-ORIGINAL ink cartridges are NOT recognized by the printer. This is because printers’ firmware has been updated from the Epson server to the newest firmware where not original ink cartridges are forbidden to be used. In this case, You have to Downgrade firmware back to old.
– When the Epson SX420W printer is updated to the new firmware, only genuine ink cartridges are received but not compatible ink cartridges. If we try to insert a compatible ink cartridge into the SX420W printer, the printer will warn not to recognize the cartridge and give error messages: Epson SX420W Incompatible Ink Cartridge, ink cartridges are not recognized, the ink cartridge is not recognized.
– This article shows how to downgrade the firmware version for Epson SX420W. Fix Epson SX420W printer error not recognizing external ink cartridges: Epson SX420W Incompatible Ink Cartridge, ink cartridges are not recognized, the ink cartridge is not recognized.
– After Downgrade Firmware for Epson SX420W printer, the printer can recognize the ink cartridge or we can install a compatible ink cartridge for Epson SX420W printer.
– Epson SX420W firmware key can fix data recovery mode errors, freezes, and cannot boot into normal mode.
How to downgrade firmware Epson SX420W
– Unplug all USB connections to the computer except keyboard, mouse, and Epson SX420W printer need to downgrade firmware version.
– Download Downgrade Firmware Epson SX420W:
– Free Download Software Downgrade Firmware Epson SX420W for Windows: 
– Free Download Software Downgrade Firmware Epson SX420W for MAC OS:
Step1.: Install the Wicreset software, then check if the Epson SX420W printer is supported with the firmware change feature:
– If supported, we see how to enter Service Mode (Update Mode) for Epson SX420W color printer
Step2.: Connect the Epson SX420W printer to the computer with a USB cable, then click Change Firmware to see how to enter Service Mode.
– How to enter Service Mode:
Step3.: Select Epson SX420W printer to Downgrade Firmware.
Step4.: Select Epson SX420W printer then click Update.
Step5.: select Yes to continue.
Step6.: Enter the Epson SX420W Firmware Key, then click OK.
Step7.: Wait for the software to automatically downgrade the firmware version for Epson SX420W printer.
Step8.: Click OK to complete the firmware version downgrade process for Epson SX420W printer.
Step9.: Check the SX420W printer firmware after downgrading the version.
Video tutorial to downgrade Epson SX420W printer version:
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