Samsung Begins Testing Galaxy Tab S12 Ultra Firmware as Launch Nears

Samsung has begun internal testing of the Galaxy Tab S12 Ultra, marking a significant step forward in the development of its next-generation tablet lineup. The confirmation comes from firmware activity detected on Samsung’s servers, where a build for model number X946B was identified, corresponding to the Galaxy Tab S12 Ultra variant.

The firmware, labeled version X946BXXU0AZDN, was spotted by industry monitor SammyGuru and reported through multiple technology tracking channels. This activity indicates that Samsung has progressed beyond initial development into the validation phase, where software stability and hardware compatibility are assessed prior to final production.

According to prior reports, Samsung plans to launch two flagship tablets in the Galaxy Tab S12 series this year: the Galaxy Tab S12+ and the Galaxy Tab S12 Ultra, skipping a standard base model. This approach mirrors the strategy used in previous generations, where premium variants received priority in development and release scheduling.

The Galaxy Tab S12 series is expected to succeed the Galaxy Tab S11 lineup, which was officially released in September 2025. Samsung has historically maintained an annual refresh cycle for its premium tablet range, suggesting that the Tab S12 series could follow a similar timeline and become available in September 2026.

One of the few confirmed hardware details about the upcoming devices relates to the battery capacity of the Galaxy Tab S12+. Leaked information indicates it may feature a 10,392mAh battery, which Samsung could market as a 10,500mAh unit for consumer clarity. No official specifications have been released for the Galaxy Tab S12 Ultra at this stage, though it is anticipated to include a larger display and enhanced performance components compared to the Plus variant.

Software expectations for the new tablets point to launch with Android 17-based One UI 9, continuing Samsung’s practice of aligning major device releases with the latest version of its user interface. This would ensure compatibility with the newest features in Samsung’s ecosystem, including enhanced multitasking, S Pen integration, and Galaxy AI functionalities.

While no official announcement has been made regarding pricing, availability, or specific hardware components such as processor choice or display technology, the firmware testing phase confirms active progress toward a consumer release. Industry observers note that such internal validation typically precedes public announcements by several months, aligning with a potential third-quarter 2026 launch window.

As development continues, further details about the Galaxy Tab S12 series are expected to emerge through official channels, regulatory filings, or additional supply chain disclosures. For now, the detection of firmware under model X946B serves as the most concrete evidence yet that Samsung is advancing its next tablet generation toward reality.