So I reviewed it and it’s actually quite an involved procedure. It seems like they wanted to address every possible scenario of an unintended tailgate release.
For 2015-2018 models, a prior FSA had the dealer install a jumper harness to isolate circuits that could short power to the tailgate release signal circuit. 2019/2020 models had the jumper harness from the factory. For all 2015-2020 models in 21M06, the BCM software is updated to require the vehicle to be in Park and the tailgate release button to be pressed twice consecutively for the BCM to actuate the release. They also have the dealer inspect the BCM for water intrusion/corrosion and make some wiring modifications to add a relay near the BCM.
You know, since about 2005 it has amazed me what they can do with a software update.
Back in 1988 to 1995 when an emissions recall required a "recalibration " we had to replace the entire PCM.
Come 1996 and OBD II, software updates came at us by the dozen
The best one ever, 1994 1/2 -1995 7.3 PSD left the factory with both EEC IV and OBD II connectors. EEC IV was live OBD II dead. In 1996 update was released to update all 7.3 PSD to OBD II diagnostics.
Truck would drive in with EEC IV diagnostics and leave with OBD II.
EEC IV was extremely limited in data.
With in about 10 minutes you went from next to no data to so much data you couldn't comprehend it.
You young guys have no idea how good you have it.