Dan's Epson printer won't take his wifi password anymore and he can't update the firmware. Leo says Dan may have changed the WiFi password and forgot to input that new password into the printer. That's easy to forget to do. Leo recommends resetting your printer and then re-enter the WiFi password on your network setup. You'll also be able to download and install the firmware update. If that doesn't work, you may need to reset your WiFi password and start over.