I am curious what are you going to check that cannot be shared to me so I would try by myself first ? because I followed instruction and unfortunately bootloader cannot be detected even I did it successfully many times before 
I have another 32 channel controller, but older model (KC868-H32L) and I just tried and it works well
one more thing that I noticed when upgrading the bootloader, when I did open the file the there a lot of following errors
I have another 32 channel controller, but older model (KC868-H32L) and I just tried and it works well
one more thing that I noticed when upgrading the bootloader, when I did open the file the there a lot of following errors