"README Firmware Update Guide" is not explaining the steps for installing the dyna-cabs and the firmware (the order of installing both sysex files). So after reading, I didn't know if I have to install first the firmware or the dynacab file.
"README DynaCab Installation Guide" explains the order step by step very well:
1. Ensure that Fractal-Bot is the latest version.
2. Extract the firmware and Dyna-Cab .syx files from the zip archive.
3. Launch Fractal-Bot.
4. Install the firmware first using the firmware image extracted in Step 2 following the instructions in the Firmware Update Guide.
5. After rebooting you may see a warning that the Dyna-Cab data is not installed or the wrong version. If so, press Exit.
6. Install the Dyna-Cab data using the data image extracted in Step 2. Drag-and-drop the .syx file onto Fractal-Bot as you would a firmware image. Send the data. Reboot when instructed.
Maybe you could add in the FAQ section of the "README Firmware Update Guide" the question "Do I have to install first the dyna-cabs or the firmware sysex file?"