I would suggest that you reload your SHOW file again.
The 16 FX sends are a part of the settings (MixRack -> Config -> Mixer Config) that users can change. When the Firmware was updated to 2.0, I am not surprised that it changed the buss configuration during the process. This is why you have to reload your SHOW file after any firmware update to ensure the system is “put back” to the way it was prior to the firmware update.
Long story short – firmware updates routinely mess up your system’s settings. Loading your show file after an update should “reset” everything back to the way you want/expect it.
If you are still having problems, please post a picture of your Mixer Config screen (where you choose the buss architecture).