Epson WF-7820 Firmware Downgrade (CD08M4) This repository provides a modified .dmg file to downgrade the firmware of the Epson WorkForce WF-7820 printer to version CD08M4. This older firmware version restores compatibility with third-party ink cartridges, which newer updates (e.g., CD30N1) often block.
Current as of March 21, 2025.
Purpose Epson’s firmware updates can prevent the use of affordable third-party ink. This repo offers a pre-modified installer with the CD08M4 firmware extracted and bundled, making it easier for macOS users to revert their WF-7820 without manually extracting or modifying files.
Files WF-7820_CD08M4_Downgrade.dmg: The modified macOS installer containing the older .rcx and .efu firmware file that doesn't detect for 3rd party ink.
Requirements Epson WF-7820 printer macOS computer I used intel MacBook running macOS 15.4 USB cable (Wi-Fi not supported for this process) Basic familiarity with macOS Finder and printer setup
Installation Instructions Download the .dmg Click the WF-7820_CD08M4_Downgrade.dmg file in the repo, then download it via the "Raw" or "Download" button. Prepare the Printer Turn off the WF-7820. Connect the printer to your Mac via USB. Enter Recovery Mode for the WF-7820 you need to put your printer into recovery mode by pressing and holding the following buttons simultaneously 4,7, job/status, power button Release both. The screen should display “Firmware Update Mode” or “Recovery Mode” in white text. Retry if it boots normally. Run the Installer Double-click WF-7820_CD08M4_Downgrade.dmg to mount it. Open “Firmware Updater.app” inside the mounted volume. Follow the on-screen prompts to downgrade the firmware. Do not disconnect the printer or interrupt the process (takes ~10-15 minutes). Verify and Finish After completion, the printer may restart. If not, unplug it for 10 seconds, then power it back on. Disable Auto-Updates Warnings Risk of Bricking: Interrupting the update or using the wrong firmware could render your printer unusable. Proceed at your own risk. File Source: This .dmg is modified from an official Epson installer. Scan it with antivirus software before use. Compatibility: Only tested with WF-7820. Other models (e.g., WF-7840) may need different firmware. Legal Note: Modifying firmware may void your warranty. Check Epson’s terms.
I got all the info from here: https://www.ifixit.com/Answers/View/741186/Problem+downgrading+the+firmware+of+an+Epson+WF-7840?permalink=answer-841683#answer841683
License This project is shared for educational purposes under the . Use responsibly.