First firmware build spotted on OTA server signals early development phase for 2026 flagship smartphone
Samsung has initiated software development for its Galaxy S26 Ultra, with the first firmware build appearing on the company's OTA update server. The firmware, version S948USQU0AYG8, corresponds to model number SM-S948 and is believed to be based on Android 16 with One UI 8.5, marking a significant milestone in the device's development timeline.
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The discovery came through Samsung's official OTA (Over-The-Air) software update server, where firmware for Galaxy devices is typically stored and distributed. Technology tipster Tarun Vats spotted the firmware build carrying the designation S948USQU0AYG8, which follows Samsung's established model numbering convention.
According to Samsung's naming pattern, the SM-S948 model number aligns with what would be the Galaxy S26 Ultra, confirming this as the first official firmware build for the upcoming flagship. The tipster suggests this firmware runs on Android 16-based One UI 8.5, indicating Samsung is already adapting its custom interface to Google's next major Android release.
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This early software development phase represents a crucial step in Samsung's product development cycle. Starting firmware work approximately 18 months before the expected launch allows the company ample time for optimization, feature integration, and extensive testing across different markets and carrier configurations.
The timing aligns with Samsung's typical development schedule for its flagship S series. With the company traditionally launching new Galaxy S models in January or February, industry observers expect the Galaxy S26 series to debut in early 2026, maintaining the annual refresh cycle.
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Recent leaks have painted a picture of significant hardware improvements for the Galaxy S26 Ultra. The device is expected to feature Qualcomm's next-generation Snapdragon 8 Elite 2 processor, maintaining Samsung's partnership with the chip manufacturer for its flagship devices. Battery capacity is rumored to remain at 5,000mAh, but charging speeds may exceed the current 45W standard.
Camera improvements also appear to be a priority, with reports suggesting the rear primary camera will feature a wider aperture than the Galaxy S25 Ultra, potentially improving low-light photography and creating more pronounced depth-of-field effects.
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Samsung's Galaxy S series represents the company's premier non-foldable smartphone lineup, competing directly with Apple's iPhone and Google's Pixel series. The Ultra variant typically showcases Samsung's most advanced technology, including S Pen support, multiple telephoto cameras, and premium materials. The Galaxy S25 series is expected to launch in early 2025, meaning Samsung is working on multiple generations simultaneously—a common practice in the smartphone industry.
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With firmware development underway, Samsung has crossed a significant milestone in the Galaxy S26 Ultra's creation. The next phases will likely include hardware prototyping, component sourcing, and extensive software testing. As development progresses, more details about specifications and features are expected to emerge through supply chain sources and regulatory filings. Industry watchers anticipate additional leaks about the Galaxy S26 Edge and standard S26 models as Samsung continues its parallel development approach for the entire lineup.
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