Apple iPhone 15 iOS 17.5.1 firmware
Apple iPhone 15
Not signed
iOS 17.5.1
Build 21F90 For iPhone15,4, D37AP
Global · IPSW
A newer version is available for this region: iOS 27.0.1
Apple no longer signs this version, so a normal restore with Finder or iTunes will fail. Use a signed version unless you know you need this one.
Download
7.54 GB
Downloads from updates.cdn-apple.com.
File details
- Device
- Apple iPhone 15
- OS
- iOS 17.5.1
- Region
- Global
- Type
- IPSW
- Released
- Size
- 7.54 GB
- File name
iPhone15,4_17.5.1_21F90_Restore.ipsw- MD5
9190b62b420b78cb7b0023079f796b55- SHA-1
b8b9b53e56b81056d7edbfacbb279a613daa9db3- SHA-256
eaa1d9f7da8df40a2b1cf1394abd38cdbcd709fb854aea2f4a0a867e3d770f2b
After downloading, compare the checksum with the one above. If they differ, the file is incomplete — download it again.
Before you download
- Make sure your device’s model number is one of: iPhone15,4, D37AP. You will find it in Settings → About phone, or on the box.
- This file is for the Global region. Installing another region’s firmware can remove features or block updates.
- Apple devices can only restore versions marked “Signed”.
- Back up your photos, contacts and files first, and charge the battery above 50%.
How to install
Use Finder on a Mac or the Apple Devices app / iTunes on Windows to install an IPSW file. Apple only accepts versions it is still signing, so check the “Signed” label before you download.
Read the guide: How to restore an iPhone, iPad or iPod with an IPSW file