Managed to get the engine running again.
First, there is a lot of new menu's, some of which have "INVALID" configuration by default. I made sure they were set to valid entries and disabled the functions for now.
However, the reason the car didn't run was because the Fuel Pump PWM Control was turned on by default with the new firmware (new feature). I set it to Disabled, and engine started right up!
Speed Sensor menu still grayed out