The eprom inside the eec-iv is proprietary to Ford so you cannot get hold of it very easily and it's soldered to the circuit board. Re-flashing is possible but hardly anyone has the kit and knowledge to do it. Luckily it can be easily 'chipped' by means of a J3 chip adapter. Be careful though, some of the chips available are absolute rubbish and you need to find out exactly what they've changed to decide if the vendor's done a reasonable tune.