this firmware update is probably to address a problem i have experienced.
my garage is not perfectly level, it has happened to me 3 - 4 times over the last 2.5 years that after i shifted to P, turned car off, as i was stepping out of the car, i noticed the car was inching forward. i had to turn the car on, shift out of P and P again, then i heard the click sound that lock the transmission when i release the brake pedal.
now i look for that click sound every time i park, i seldom use the parking brake.
Andy - SoulEV
"But in our enthusiasm, we could not resist a radical overhaul of the system, in which all of its major weaknesses have been exposed, analyzed, and replaced with new weaknesses." BL - Register Allocation in Optimizing Compilers