so got my new serial-usb lead as purchased from the VEMS shop last week, yesterday.....
and i have the same issue....."cannot leave boot mode".....
And doesn't always connect everytime, proberly worse than my last serial-usb cable.
So now i think it must be a ECU problem, tried 3 laptops, with different windows versions, tried older & newer cable drivers, tried all the settings in vemstune.
is it possible to test it any other way, as i am really out of options.
cheers
scott