What Omex ECU is it 500, 600 or 700 as some versions of firmware on the 700 ECU atleast have problems which mean everytime you plug in the ECU it asks for the password, at this stage switch off the ECU and power it backup and most of the time it goes past this stage. Another bug in some versions of firmware also mean some laptops do not work very well and I had to use 3 different until I got mine talking correctly. If the tuner stats that he did not set a password then talk to Omex and get there advice as it may be your laptop etc.