Samsung starts early testing of One UI 9.5 for Galaxy S26 series; firmware build CHZ1 in development, beta may arrive earlier than predecessor

Samsung starts early testing of One UI 9.5 for Galaxy S26 series; firmware build CHZ1 in development, beta may arrive earlier than predecessor

Samsung has begun early testing of One UI 9.5 for the Galaxy S26 series, with firmware build CHZ1 in development. This marks a quicker timeline compared to One UI 8.5, suggesting the beta may launch sooner than expected, potentially benefiting users of older devices as well.

SamMobile SamMobile10 August 2026 · 11:51 UTC
CuriousCats Full Story

Samsung is advancing its software development timeline with the early testing of One UI 9.5 for the Galaxy S26 series, utilizing firmware build CHZ1.1256

This development comes notably earlier than the One UI 8.5 for the Galaxy S25 series, which began in mid-September last year.3

The expedited timeline indicates that the official One UI 9.5 beta could be released sooner than its predecessor, enhancing the user experience for Galaxy S26 users.4

Additionally, Samsung is anticipated to roll out at least one more beta update for the Galaxy S26 series, as well as for older devices, ensuring a broader range of users can benefit from the latest features.

Currently, the only way to access One UI 9 is by purchasing a Galaxy Z Fold 8, Z Fold 8 Ultra, or Z Flip 8, which are equipped with features not yet available in the One UI 9 beta for the Galaxy S26 lineup.

This proactive approach by Samsung reflects its commitment to enhancing user experience and staying ahead in the competitive smartphone market.

Key Insight
“One UI 9.5 is based on Android 17, which debuted earlier this month with the Galaxy Z Fold 8, Z Fold 8 Ultra, and Z Flip 8. Samsung's faster pace contrasts with One UI 8.5 for the Galaxy S25, which didn't start until mid-September last year.”
CuriousCats studied:
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SamMobileSamMobile
“Samsung is already testing for the Galaxy S26 series. , based on Android 17, officially debuted earlier this month with Samsung's new Galaxy Z foldables, while the , S26+, and S26 Ultra have been part of the One UI 9 beta program since May.”
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