SHANGHAI/BEIJING (Reuters) -Tesla CEO Elon Musk arrived in Beijing on Sunday on an unannounced visit, where he is expected to meet senior officials to discuss the rollout of Full Self-Driving software and permission to transfer data overseas, according to a person with knowledge of the matter.

Chinese state media reported that he met Premier Li Qiang in Beijing, during which Li told Musk that Tesla (NASDAQ:TSLA)'s development in China could be regarded as a successful example of U.S.-China economic and trade cooperation.

Musk confirmed his meeting with the premier on Sunday with a post on social media platform X.

"Honored to meet with Premier Li Qiang. We have known each other now for many years, since early Shanghai days," Musk posted, with a picture with the premier.

Tesla reached an accord with Chinese authorities for a plant in Shanghai, its first outside the U.S., in 2018.

The U.S. electric vehicle maker rolled out Full Self-Driving, or FSD, the most autonomous version of its Autopilot software, four years ago but has yet to make it available in China, its second-largest market globally, despite customers urging it to do so.

Musk said this month Tesla may make FSD available to customers in China "very soon", in response to a query on social media platform X.

Rival Chinese automakers such as Xpeng (NYSE:XPEV) have been seeking to gain an advantage over Tesla by rolling out similar software.

Musk is looking to obtain approval to transfer data collected in the country abroad to train algorithms for its autonomous driving technologies, the person said.

Tesla has since 2021 stored all data collected by its Chinese fleet in Shanghai as required by Chinese regulators and has not transferred any back to the United States.

Musk's visit to China, first reported by Reuters, was not flagged publicly and the person spoke on condition of anonymity because they were not authorised to speak with media. Tesla did not respond immediately to a request for comment.

Chinese state broadcaster CCTV, in its report about Musk's meeting with Li, did not say whether the two had discussed FSD, or data.

Earlier in the day, a separate report carried by state radio said Li had visited the ongoing Beijing auto show and had commented about how China's smart new energy vehicle (NEV) sector had gained a leading position in the market and that the country had to work hard and maintain its advantages.

Musk also met with Ren Hongbin, a government official who heads the China Council for the Promotion of International Trade, the organiser of the Beijing auto show, state media reported.

"It is good to see electric vehicles making progress in China. All cars will be electric in the future," Musk said in a video posted on social media by a user affiliated with state media.

Late on Sunday, a top Chinese auto association published a list of 76 car models it said it had tested and found to be compliant with China's data security requirements, among them being Tesla's Model Y and 3 cars.