I took a quick look through my mail archive from 2017 and found out the following:
1 My friends' plotter was a C80 not an E80, sorry. I'm not sure but was the only difference the
screen size?
2 A 128MB (note MB not GB) CF card would not work. A 16MB did.
3 The CF card had to be formatted to FAT16, not the now common FAT32.
Hopefully your plotter is already at the latest firmware and thus you won't need all this.
Good luck!
Aedan