IPSW · macOS
macOS 27 IPSW Downloads
Every macOS 27 restore image Apple published — 10 builds from macOS 27.0 beta to macOS 27.0 RC, 0 of them public releases — for 61 Macs. Pick a build to choose your device.
Every macOS 27 build
Newest first. Size is the largest file in the wave; open a build for every device's file, hash and link. Signing status checked September 12, 2026.
| Version | Type | Released | Size | Signing | |
|---|---|---|---|---|---|
26A428 |
RC | September 9, 2026 | 26.63 GB | Signed | 61 devices → |
26A5425a |
Beta | August 31, 2026 | 22.74 GB | Signed | 57 devices → |
26A5421a |
Beta | August 24, 2026 | 22.76 GB | Signed | 57 devices → |
26A5416b |
Beta | August 17, 2026 | 22.74 GB | Signed | 57 devices → |
26A5406e |
Beta | August 10, 2026 | 22.74 GB | Signed | 57 devices → |
26A5388g |
Beta | July 20, 2026 | 22.66 GB | Signed | 57 devices → |
26A5378n |
Beta | July 13, 2026 | 22.59 GB | Signed | 57 devices → |
26A5378j |
Beta | July 6, 2026 | 22.57 GB | Signed | 57 devices → |
26A5368g |
Beta | June 22, 2026 | 22.66 GB | Signed | 57 devices → |
26A5353q |
Beta | June 8, 2026 | 22.57 GB | Signed | 57 devices → |
Nothing matches that filter.
Other macOS versions
Questions? Answers.
Can I still install macOS 27?
Only on devices Apple is still signing it for. macOS 27.0 RC (26A428) is currently signed for 61 models: Mac mini (M5 Pro), Mac mini (M6), Mac Studio (M5 Max), Mac Studio (M5 Ultra), MacBook Air (13-inch, M5), MacBook Air (15-inch, M5), MacBook Neo, MacBook Pro (14-inch, M5 Max) and others. Every other macOS 27 build is unsigned and will be rejected at the end of a restore.
How do I downgrade to macOS 27?
Only to a build Apple is signing, and only by erasing: a recovery-mode restore in Finder, the Apple Devices app or iTunes with the IPSW for your exact model. A backup made on a newer version will not restore onto macOS 27, so the backup you need is one taken before you upgraded. Our downgrade guide walks through it.
What does "signed" mean?
Apple's servers must approve a firmware before a device will accept it, and Apple only approves the builds it is currently shipping. A signed file can be restored today; an unsigned one is rejected at the end of the process, however you obtained it. Signing status changes without notice, usually within days of a newer release, which is why this catalogue rechecks it automatically.
Will I lose my data?
A Restore erases the device — that is what makes a downgrade possible. An Update with an IPSW keeps your data, but only when moving to a newer version. Either way, make an archived backup on a computer first; an iCloud backup taken on a newer version will not restore onto an older one.