Core Points - 91 Assistant, a classic iPhone/iPad management tool, has completely ceased operations after nearly 20 years of service [2][3] - The service termination includes the shutdown of the client application, website, help center, and customer service channels, resulting in permanent data loss for users [3] - Refunds are available for users with active memberships, but they must apply proactively before the deadline of September 15, 2025 [3] Company Background - 91 Assistant was developed and launched by NetDragon in 2007, initially providing "jailbreaking," application installation, and file management services for iPhones [4] - The application expanded to the Android platform in 2009, capturing nearly 90% of the domestic mobile assistant market at its peak [4] - In 2013, Baidu acquired 91 Wireless, the parent company of 91 Assistant, for $1.9 billion, marking the largest acquisition in China's internet industry at that time [4] Industry Context - The rise of official app stores, such as Apple's App Store and various OEM app stores, diminished the need for third-party tools like 91 Assistant [5] - The increasing openness of Apple's iOS system led to a decline in "jailbreaking" demand, which was a key value proposition for 91 Assistant [5]