Updates are distributed online, but applied by technician with a portable data loader device (a computer with special - partially standardized - interface cable

Updates are distributed online, but applied by technician with a portable data loader device (a computer with special - partially standardized - interface cable). The actual update in this case is about 15 minute work, the often seen "2h" claim is the entire cycle of powering the aircraft down for maintenance, update, verification, etc.