The software update lasted for more than an hour and during the process, the car refused to start - and had locked its passengers inside the car. According to Nio, several police officers had tries to open the car windows in order to free the passengers, but they had failed. After the software update was finished, car had resumed its normal operation.
Nio says that the driver "accidentally made a series of operations that activated the system update" during a traffic jam on Changan Avenue. After the incident the company said: "We apologised for affecting the traffic and we will optimise the upgrade confirmation logic."
Several Chinese news sources confirm the story, including South China Morning Post.