On 5 September Xiaomi released Mi A1, which is the first Android One smartphone under the slogan: Created by Xiaomi, Powered by Google. In the event key note Xiaomi stated they started working with Google for the Mi A1 Android One smartphone almost six months ago. An alternate version of the phone is also available with MIUI and is known as MI 5X.
On 4 September 2017, the Hong Kong independence issue made a high-profile reappearance as the banners calling for independence surfaced at the Chinese University of Hong Kong (CUHK) overnight ahead of the new academic year. The school staff quickly removed them.
On 11 September, Chief Executive Carrie Lam denounced the pro-independence banners and posters, asserting the students' message ran counter to the "one country, two systems" principle and the Basic Law, "I condemn the continued appearance of such remarks on university campuses, which is in violation of our country’s sovereignty, territorial integrity and development interests," she said. She also insisted academic freedom and university autonomy were no excuse for propagating fallacies.
In 12 September 2017, IKEA announced the augmented reality app, IKEA Place, following by Apple's release of its ARkit technology and iOS 11. IKEA Place helps consumers to visualize true to scale IKEA products into real environment.
On 13 September 2017, she was returned President-elect in a walkover, as no other presidential candidate was issued the Certificate of Eligibility. She was sworn in the following day, becoming the first female president in the country's history.
On 15 September, ten university heads in Hong Kong, City University of Hong Kong, Hong Kong Baptist University, Hong Kong Shue Yan University, Lingnan University, the Chinese University of Hong Kong, the Education University of Hong Kong, the Hong Kong Polytechnic University, the Hong Kong University of Science and Technology, the Open University of Hong Kong and the University of Hong Kong, condemned the "recent abuses" of the freedom of expression in a joint statement, adding that all the universities do not support Hong Kong independence as it contravenes the Basic Law.
On 18 September, Totti began studying for a course in order to obtain his UEFA B coaching licence. However, he withdrew from the course two weeks later, as he was unable to attend the course regularly due to his commitments as a director of Roma; his former teammate Simone Perrotta took his place.
On 21 September 2017, Google announced that it would acquire roughly half of the 4,000 employees who worked in HTC's design and research staff, and non-exclusive licenses to smartphone-related intellectual property held by HTC, for US$1.1 billion. The employees included the team involved with Google's Pixel smartphone, which was manufactured by HTC. Google stated that the purchase was part of its efforts to bolster its first-party hardware business. The transaction was completed on 30 January 2018; while HTC will continue to produce its own smartphones, the company has stated that it planned to increase its focus on the Internet of Things (IoT) and virtual reality going forward.
In the 2017 election, Merkel led her party to victory for the fourth time. Both CDU/CSU and SPD received a significantly lower proportion of the vote than they did in the 2013 election, and attempted to form a coalition with the FDP and Greens. The collapse of these talks led to stalemate. The German President Frank-Walter Steinmeier subsequently appealed successfully to the SPD to change their hard stance and to agree a 3rd grand coalition with the CDU/CSU.
The temporary order was replaced by Presidential Proclamation 9645 on September 24, 2017, which permanently restricts travel from the originally targeted countries except Iraq and Sudan, and further bans travelers from North Korea and Chad, along with certain Venezuelan officials. After lower courts partially blocked the new restrictions, the Supreme Court allowed the September version to go into full effect on December 4, and ultimately upheld the travel ban in a June 2019 ruling.
From September 25-27, 2017, Zoom hosted Zoomtopia 2017, its first annual user conference. At this conference, Zoom announced a partnership with Meta to integrate Zoom with augmented reality, integration with Slack and Workplace by Facebook, and first steps towards an artificial intelligence speech recognition program.