Thanks for the additional information.
Most important question remains unanswered: What version of Windows (XP, Vista, 7, 8/8.1 or 10)?
That is important because there may or may not be drivers/software for that printer for your version of Windows.
Assuming that there are drivers for your version of Windows, I suggest starting from scratch.
I would cleanly remove all Epson software and drivers (and any remaining folders, if need be) and reboot the computer.
Then, I would go to the Epson site and download a fresh copy of the drivers/software for your version and architecture:
Then, I would download and save a copy of the User Guide/Manual:
Then, I would follow the setup wizard instructions for the driver/software installation, using the posted videos to guide you, if necessary:
You may wish to try a wired (Ethernet) setup first, to rule out problems with wifi connectivity.
Most AIO printers allow one to switch from wired to wifi....
Under normal circumstances, I would think one would not necessarily need to (or be able to) update the printer FIRMWARE until the printer drivers/software itself is actually installed.
Please let us know how it goes, so that we can all learn.