Samsung has started a second October update for the Galaxy S24 series and the Galaxy S24 FE in South Korea on November 9, 2026. The new builds end in EZJB or EZJD and replace the EZJ1 security release from October 22. Samsung’s update server already offers them on some Korean channels.
If you own a Korean S24, the fastest check is your build number. Open Settings > About phone > Software information, then compare it with the table below.
Galaxy S24 second October update builds
Each phone has its own build, and not every carrier has it yet. Here’s what Samsung’s server listed for each Korean model on the morning of November 9.
| Phone | Model | October 22 build | New build | Channels with it |
|---|---|---|---|---|
| Galaxy S24 | SM-S921N | S921NKSSIEZJ1 | S921NKSUIEZJD | KOO, SK Telecom |
| Galaxy S24+ | SM-S926N | S926NKSSIEZJ1 | S926NKSUIEZJB | SK Telecom |
| Galaxy S24 Ultra | SM-S928N | S928NKSS6EZJ1 | S928NKSU6EZJB | SK Telecom |
| Galaxy S24 FE | SM-S721N | S721NKSSFEZJ1 | S721NKSUFEZJB | KOO, SK Telecom |
KT phones still show the October 22 build for all three S24 models. The S24 Ultra on LG U+ and the S24+ and Ultra on KOO are also still waiting, so it’s a staged release.
How this differs from the October 22 update
Korea already got an October update. Samsung’s Korean release history for the Galaxy S24 FE lists S721NKSSFEZJ1 on October 22, with Android 17 and the October 5 security patch. Its note says security-related stabilization code was applied.
The new builds are a step after that. Look at the three letters right after the model number. The October 22 builds read KSS, which Samsung uses for security-only releases, while the new EZJB and EZJD builds read KSU, which marks an update with software changes beyond security fixes.
Z stands for 2026 and J for October, so this is still October firmware. Our Samsung firmware version guide explains the rest of the string.
Samsung hasn’t added these builds to its release history yet. So there’s no official changelog or patch date for them right now, and I wouldn’t expect the November patch here. Our November 2026 security update tracker lists the phones that have it.
Which October build is on your S24?
Both October builds look almost the same at a glance, so compare the last part of the string. If your Galaxy S24 Ultra shows S928NKSS6EZJ1, you have the October 22 security release. If it shows S928NKSU6EZJB, you already have the second October update.
The same check works for the other three phones using the two build columns in the table. Android version won’t help here, because both builds run Android 17.
Install the Galaxy S24 second October update
- Connect to Wi-Fi and charge your phone past 50 percent.
- Go to Settings > Software update > Download and install.
- If the update shows up, tap Download, then Install now.
- After the restart, check Settings > About phone > Software information for the new build.
Your phone may restart more than once while it installs. That’s normal.
On KT or LG U+? Give it a few days, since those channels haven’t switched over yet. If your S24 still isn’t on One UI 9 at all, start with our Galaxy S24 One UI 9 update post, and our guide to the One UI 9 update not showing covers the usual reasons.
Will the second October update reach other countries?
Samsung hasn’t said. Right now these builds exist only for the Korean N models, so international S24 phones won’t see them yet.
You can track your own model and CSC in our Samsung firmware checker. Have you got the new build on your S24? Tell me your model and carrier in the comments.
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