I couldn't flash the version you wrote either, apparently it's for a different version of the controller. I rode this one:https://www.emtbforums.com/attachments/crx10vc4313e102006-3-boot3-0-_201006-bin.165398/
Don't worry, feel free to try to change and apply the advanced settings, it won't break the firmware or the controller. My m420 also reads 0 and unfortunately the settings are not applied, it does not break anything. They are not used on all engines, you need to try. But other settings work...
Latest display firmware required SW: EKD01_CAN_BF_N22
The display can be flashed with any third-party firmware, the main thing is HW: B02NC_1.01
Tested on bafang m510 and m420 works great.
Setting the speed limit up to 99 km/h and quickly resetting to 25 km/h by pressing the + and - keys...