One UI 8.5 Lands on Galaxy A15 and A24: What’s New?

You might not spot it in the quick scroll through settings. One moment the phone is the same; the next, a reboot and subtle polish. Samsung has started pushing the stable One UI 8.5 update to two of its budget-focused models in South Korea — and it’s more than just a number.

What’s actually inside

The Galaxy A15 4G (model SM-A155N) is receiving firmware A155NKSU9DZF1, an update of roughly 2.5GB that bundles the May 2026 Android security patch. Its sibling, the Galaxy A24 4G (model SM-A245N), is on firmware A245NKSU9FZF1 and needs around 2.4GB of download space. Both builds aim to refine stability and roll in security fixes rather than overhaul the interface.

Why should you care? Small patches like this tighten security and smooth out quirks that accumulate after months of daily use. Expect snappier animations, fewer odd freezes, and improved app compatibility on recent titles and services.

If you own either model, plan for a 2.4–2.5GB download and ensure a Wi-Fi connection and decent battery before updating.

Not in South Korea? Don’t worry. Samsung typically stages country rollouts over days or weeks. If your phone hasn’t prompted the update yet, check manually by opening Settings and tapping Software update. If the build isn’t available in your region, it should arrive soon.

Pro tip: back up important data before starting any major firmware change. It’s quick and saves headaches if something unexpected happens during installation.

For owners tracking firmware by model numbers and build codes, these South Korea releases give a clear signal the company is moving forward with One UI 8.5 across its midrange lineup. Keep an eye on official channels or your carrier’s update bulletin if you want the exact timing for your market.