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I was thinking about adding a CISS system to my printer, everything I read says don't upgrade the firmware. So I was wondering about a downgrade, since I have upgraded my firmware.

I have an Epson XP 960 and want to install a CISS system. All the instructions that I have seen are confusing to me. I understand that I need to downgrade my firmware since a new version has been installed. Can anybody help me to understand what I need to do? Thanks Greenie