Apple today released iOS/iPadOS 26.4 Developer Preview Beta 4 (build number: 23E5234a) to iPhone and iPad users, 7 days after the last Beta/RC release.
How do I upgrade to the iOS/iPadOS/watchOS/macOS developer and public beta versions?
• Public beta: Requires registration for the Apple Beta Software Program, then upgrade via Settings > General > Software Update > Beta Update;
• Developer Preview: You need to log in and register for the Apple Developer Program, and then upgrade through Settings > General > Software Update.
Here is a complete list of Apple iOS historical firmware downloads:
Apple iOS / iPadOS / macOS Firmware Downloads / Update Logs.
This article was published by a robot. IT Home will bring you detailed updates later.
Appendix: Release history of iOS/iPadOS 26
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2026-03-05: iOS 26.3.1 (23D8133)
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2026-03-03: iOS 26.4 Beta 3 (23E5223f)
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2026-02-24: iOS 26.4 Beta 2 (23E5218e)
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2026-02-17: iOS 26.4 Beta (23E5207q)
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2026-02-12: iOS 26.3 (23D127)
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2026-02-05: iPadOS 26.3 RC (23D125)
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2026-01-27: iOS 26.2.1 (23C71)
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2026-01-27: iOS 26.3 Beta 3 (23D5114d)
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2026-01-13: iOS 26.3 Beta 2 (23D5103d)
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2025-12-16: iOS 26.3 Beta (23D5089e)
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2025-12-13: iOS 26.2 (23C55)
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2025-12-04: iOS 26.2 RC (23C52)
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2025-11-18: iOS 26.2 Beta 3 (23C5044b)
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2025-11-13: iOS 26.2 Beta 2 (23C5033g)
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2025-11-05: iOS 26.2 Beta (23C5027f)
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2025-11-04: iOS 26.1 (23B85)
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2025-10-29: iOS 26.1 RC (23B82)
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2025-10-21: iOS 26.1 Beta 4 (23B5073a)
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2025-10-14: iOS 26.1 Beta 3 (23B5064e)
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2025-10-07: iOS 26.1 Beta 2 (23B5059e)
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2025-09-30: iOS 26.0.1 (23A355)
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2025-09-26: iOS 26.1 Beta (23B5044l)
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2025-09-16: iOS 26 (23A341)
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2025-09-03: iOS 26 Beta 9 (23A5336a)
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2025-08-26: iOS 26 Beta 8 (23A5330a)
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2025-08-19: iOS 26 Beta 7 (23A5326a)
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2025-08-12: iOS 26 Beta 6 (23A5318c)
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2025-08-06: iOS 26 Beta 5 (23A5308g)
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2025-07-23: iOS 26 Beta 4 (23A5297i)
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2025-07-08: iOS 26 Beta 3 (23A5287g)
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2025-06-24: iOS 26 Beta 2 (23A5276f)
