OK, I found there is a command line utility in your software package, I thought maybe I can run it in my Kodi box to debug the issue. No go. My Kodi box has no 32-bit support and the executable is 32-bit. Amen. The only OS I can run it on is my VBox Linux Mint.
Every freakin' flash utility I've used in my life offers old firmware backup in case the new one has a problem. This is the first case I experience downgrading the firmware is literally denied. Your software, your policies. For me it is time to look for a different solution, methinks. Getting frustrated, yes, sorry.