Epson Expression XP-255 should be listed as supported
I just worked for someone who owns a Epson Expression XP-255: while not listed as supported, it works well with the epson2 backend (I did not do extensive testing, only "text" and "pictures" presets with simple-scan).
To make it work, I just added the following line in
/etc/sane.d/epson2.conf, disconnected and reconnected the USB cable:
usb 0x04b8 0x113d
If this matters, it is on a Lubuntu 18.04 amd64, and Image Scan software from Epson did scan but could not save the picture…
Thanks for your time and work, Yvan