“3.5.5.2 fixed the annoying cold start stumble on my 2019 Passport. Economy mode is actually usable now without feeling like the car is asleep.” – @JseriesV6
Honda ECU 3.5.5.2 refers to a specific version of diagnostic and flashing software designed for Honda Engine Control Units (ECUs). This software, developed by MCU Innovations honda ecu 3.5.5.2
While MCU Innovations offers various versions, 3.5.5.2 is often sought after in the "tuner" and "autotronic" communities. It is frequently hosted on developer repositories like honda ecu 3.5.5.2