I've got an XP-340 that, thanks to the latest firmware update that slipped through, won't recognize 3rd party ink cartridges. I attempted manual downgrades to MJ10H8 directly, but even though the printer showed the firmware update file being transferred, it wouldn't install. I was pointed to the WIC Reset utility and just tried with that. I followed through the steps, put the printer in maintenance mode, bought the firmware key (order #19836630), and WIC reset says it's updated, but the printer still, at the end of the read/write cycle, shows the firmware as the latest version
