I have since emailed Mikey at Wanhao. He kindly sent me a HEX version of the V1.3(B) firmware, which will load though Cura >Machine>Install Custom Firmware. The only problem is: my Board appears to have an older version of EEPROM, so the printer, which was working apart from a temperature readout offset of +43 degrees, is now not working at all. I have no recovery from this unless Mikey sends me a compatible (older?) HEX file.
I too am thinking about swapping out for a RAMPS 1.4 + LCD Display, which is considerably cheaper than a replacement Wanhao board. I would prefer not to do this, as the space requirements are much greater, and will undoubtedly require some sort of external casework.
I hope to obtain all the required settings for Ramps 1.4 Marlin Configuration.h, in the i3mini.rar Configuration.h file
Cura option to ‘Install Default Firmware’ is greyed out, which is a shame, as this would be the best option. I was disappointed not to find this on the supplied SD card.