Problem downgrading the firmware of an Epson WF-7840
Good morning everyone,
I've had the bad idea to upgrade the firmware of our Epson WF-7840 (version CD17M6 now).
Now, our non epson cartridges are not recognised anymore.
I've search the web about how to downgrade the firmware. I found the procedure, found how to put the printer in "recovery mode" and, on the Epson website, I found the "Recovery Mode Firmware version CB08LC" for the Epson WF-7840.
But it doesn't work...
First problem, the model of the printer does not appear in the "Epson firmware updater" but it sees that a printer is connected.
Second problem, and it is where it stops, when I launch the Update, it fails with a message on the printer's screen "Data file not found".
I tried with my mac (macbook pro 16" m1 max) and with an older macbook pro from 2009 with the same result. I tried with another USB cable and still no luck.
What am I doing wrong?