We have several printers on firmware 65.31.81, trying to get them up to at least 65.59.11. I've tried the update utility 22.214.171.124, 126.96.36.199, and the more recent 188.8.131.52. Printers on that firmware always fail with a message "Failed to connect the device with the specified address" when updating via the network on port 9100.
If the printer has firmware version 65.50.61, I don't have any issues, the latest update utility works just fine.
Where can I get an older update utility?
I can't use the USB option, we have 100's of remote printers and I need to update via the network.