Samsung launched its Android 16-based One UI 8 working system (OS) at Galaxy Unpacked 2025 earlier this month. Whereas solely the Galaxy Z Fold 7, Galaxy Z Flip 7, and Galaxy Z Flip 7 FE run on the OS out-of-the-box, a tipster means that inside testing of the firmware for 2 older Galaxy units has begun. Inner check builds of the firmware are mentioned to have been noticed on the server for the Samsung Galaxy Z Fold 4 and the Galaxy Z Flip 4.

One UI 8 for Galaxy Z Fold 4 and Galaxy Z Flip 4

This data comes from tipster Tarun Vats’ post on X (formerly Twitter). The tipster noticed One UI 8’s inside check construct on Samsung’s server which was formally listed as a “newfound check firmware”. It’s mentioned to return with the construct model F936BXXUAIG3 for the Galaxy Z Fold 4 and F721BXXUAIG3 for the Galaxy Z Flip 4.

Notably, this discovery builds upon current sightings of the One UI 8 check construct for 2 extra Samsung smartphones — the Galaxy A55 5G and the Galaxy S24 FE. Samsung is reported to have begun the interior testing of One UI 8 in Might, beginning with the flagship Galaxy S25 series.

Nonetheless, merely the itemizing on Samsung server doesn’t reveal any timeline of One UI 8’s launch, though it does point out the event of the firmware for the aforementioned Galaxy fashions.

At the moment, solely the Samsung Galaxy Z Fold 7, Galaxy Z Flip 7, and Galaxy Z Flip 7 FE are powered by One UI 8. Different smartphones within the South Korean tech conglomerate’s portfolio nonetheless run on One UI 7 which is predicated on Android 15.

Earlier than the replace is publicly launched, these all for making an attempt out new options can join Samsung’s One UI 8 Beta programme. This enables builders and beta testers to expertise the Android 16-based OS and tailor their apps to run adeptly. This programme is obtainable in 36 nations together with India, the US, and South Korea.