Commercial aircraft have a large support staff that 'touch' the aircraft ever day (week). Certified mechanics and technicians. A software update is something

Commercial aircraft have a large support staff that 'touch' the aircraft ever day (week). Certified mechanics and technicians. A software update is something they do on a regular (yearly maybe()) basis. By following instructions provided by the OEM. Upgrading hardware is also done by the customer. People are trained and qualified to do this work all over the world.