Hi Paul,
Looking at the screen shot, is it showing the readback values or the values you tried to write?
A point to note is that the /MCLR option on the main screen should not be selected. This holds the device in reset. Unselect this option.
Another valid OLED value to try in EEPROM Addr 0 is 7A instead of 78, but all OLED displays I have used work with 78.
The meaning of the cells is covered in the manual on the github link that I had previous sent.
73, Dave
