Hi. I also need to rollback my firmware on my TomTom Spark Cardio Music. Right now I'm running on firmware 1.7.64 and has been awful. I can't use the watch on long runs or marathons because of the battery drain. I love this watch and want to keep using it. I have write tomtom directly and did everything they told me to do, factory reset a lot of times to try to see if the problem got resolved. I want firmware version to 1.3.255 again to see my watch functioning properly again. Can you please help!!!