Hi !
Actually this is the correct file, it just says to the spark, boot in DFU.
But you have to do that very fast, like in less than 5 seconds, or it will fail.
Most of the people intent more than 20 times to succeed, and so do I.
I just checked in our industrial files, where the sysex file is originally stored, and it is the same.
You need to try again
Keep me informed if you succeed.
Best Regards
Edouard