I paid and loaded the chipless firmware on my WF-3640 a week ago. But, it's gone today. New original firmware has been loaded.
My one employee just installed printer driver...and I think he just cliked "Yes" at every step including "update software option".
Anyway, I had to install ciss chips again. Now the firmware version is CB18I4.
It was OK because I didn't like the slow duplex printing(Long dry time) of Chipless firmware.
But, I found out the Slow 2-sided printing Speed was NOT recovered. It's still Slow.
So, I guess, the latest firmware of epson has long dry time as default unlike previous version. But, I am not sure.
I purchased it on March in 2018. I don't know what firmware version it has.
I know only one thing it had 0 second-dry time as default. Super fast duplex printing.
Unfortunately, I think I wasted my money. Is it wright? I have to pay again to recover to chipless firmware, don't I?
Can I get the key one more time to recover? or can I use the previous key at the same printer?
My printer has just comeback to normal firmware with super slow duplex printing speed.
I am waiting for some reply.