iOS 26.4 beta 3 is rolling out now, and a lot of people see an update that looks huge, sometimes 10GB or more. Apple lists iOS 26.4 beta 3 as build 23E5223f, released on March 2, 2026, so you are not imagining the timing.
The confusing part is the size label. A beta OTA update usually installs as a smaller delta package, but iOS sometimes offers a near-full package instead, which makes the download look like a full restore image rather than a quick patch. For at least some iPhone models, the restore file itself sits around the 10GB mark, so a “10GB+” number matches what you would expect from a full build download.
Huge Size Explained
A few common triggers explain it without any drama:
- You skipped one or more betas, so iOS pulls a larger bundle to catch you up.
- Your iPhone cached an earlier update and the Software Update screen recalculated size based on what it needs to replace.
- The delta package did not apply cleanly for your device state, so iOS offered a bigger download instead.
- You run low on free storage, and iOS becomes more conservative during the install process, which also makes failures more likely.
What you should do next
Start with the simple fixes that usually reset the updater:
- Make sure you have plenty of free space before you begin, since iOS needs room to download and unpack the update.
- If the download looks stuck or absurdly large, delete the update file and pull it again: Settings, General, iPhone Storage, find the update, then tap Delete Update, and retry from Software Update.
- If OTA keeps failing, update through a computer using the official beta install path in your developer workflow.
If your iPhone still insists on a 10GB+ download after a re-download, treat it as normal for this beta cycle and plan your Wi-Fi time and storage around it.
