Convert Nokia 1110 (RH-70) to 1600 (RH-64) (display)
Manual:
Replace the display module from 1110 with coloured module from 1600.
Flash the phone with 1600 flash files and make full factory reset.
Its not neccessary to flash the phone with 1600 flash files if you don't have flash equipment! But then the display will still show no different colours.