IPSW · iOS
iOS 17.5.1 IPSW Download (21F90)
Build 21F90, released May 20, 2024 — restore images for 25 iPhones, straight from Apple's servers.
Choose your iPhone
25 devices. Each row is one file on Apple's CDN.
iPhone15,4 8.09 GBiPhone15,4_17.5.1_21F90_Restore.ipsw SHA-256 eaa1d9f7da8df40a2b1cf1394abd38cdbcd709fb854aea2f4a0a867e3d770f2b 
iPhone15,5 8.09 GBiPhone15,5_17.5.1_21F90_Restore.ipsw SHA-256 7ae65fa01f0e5c8b9681d50a78f6859300299714664cd8037c1293cd4441e408 
iPhone16,1 8.28 GBiPhone16,1_17.5.1_21F90_Restore.ipsw SHA-256 f3c8cfaac1c636f661ecfc6e6483f2e73f25825d6a48290da2258015f946a3d2 
iPhone16,2 8.28 GBiPhone16,2_17.5.1_21F90_Restore.ipsw SHA-256 89e1eed78fb37c96e5d98f0dbf9e1569ee63e83b05657226ace2f70df803cd14 
iPhone14,8 7.94 GBiPhone14,8_17.5.1_21F90_Restore.ipsw SHA-256 97f6c67e8b4d47228f2d5377ffc014250fd70838b1ae310c37f3a5a8f94b3155 
iPhone14,7 7.95 GBiPhone14,7_17.5.1_21F90_Restore.ipsw SHA-256 f1f4d4b7ebdea23ef54ac8342da6d02d09ca7cb5dcf845a337f5670c529e41d0 
iPhone15,2 8.11 GBiPhone15,2_17.5.1_21F90_Restore.ipsw SHA-256 7efbd595572cd8962fb6d1e284364b466883b0f739af7d248e878b14820713da 
iPhone15,3 8.09 GBiPhone15,3_17.5.1_21F90_Restore.ipsw SHA-256 b7478f37a42f10d34f4a6c8318ec4f182db4dc6406aa4e04121aa7260464eb56 
iPhone14,6 7.68 GBiPhone14,6_17.5.1_21F90_Restore.ipsw SHA-256 7ed003aa0d217fd16ee33dbc001e9c4cfb8ebb996e5d3f2ae25d3e4226cf65d4 
iPhone14,5 7.89 GBiPhone14,5_17.5.1_21F90_Restore.ipsw SHA-256 4bd80b30745f6a1d3238fd379e1dabaa05b43793c4d97f5d484f77fe3c817124 
iPhone14,4 7.92 GBiPhone14,4_17.5.1_21F90_Restore.ipsw SHA-256 3af8ce45cfcc475f4c7ca44a3e0a8bd59125c362f1a99d7c02d6fff2d062fc6b 
iPhone14,2 8.02 GBiPhone14,2_17.5.1_21F90_Restore.ipsw SHA-256 bee7104f9016d0ea4531ae6e504f8d348daad16a977b5d139c16552315728304 
iPhone14,3 8.02 GBiPhone14,3_17.5.1_21F90_Restore.ipsw SHA-256 2b721ca9a419ebc03f81fddc4a630a9d7263c06db9dd98891c4e6f9d5ea47a4a 
iPhone13,1 7.83 GBiPhone13,1_17.5.1_21F90_Restore.ipsw SHA-256 028009de07cba3df0df16e754529ccee71e22a5a0131c9a76ff752c4160a358f 
iPhone13,4 7.96 GBiPhone13,4_17.5.1_21F90_Restore.ipsw SHA-256 cc4e44492cd435b2abc5ad42ce01ed8541db8048c01a93bec1184992e4ce35c5 
iPhone13,2 8.01 GBiPhone13,2,iPhone13,3_17.5.1_21F90_Restore.ipsw SHA-256 c7cc6e2f04b98320810a1b680481778402d63829691bac20915cb952cc300a1d 
iPhone13,3 8.01 GBiPhone13,2,iPhone13,3_17.5.1_21F90_Restore.ipsw SHA-256 c7cc6e2f04b98320810a1b680481778402d63829691bac20915cb952cc300a1d 
iPhone12,8 7.47 GBiPhone12,8_17.5.1_21F90_Restore.ipsw SHA-256 55fb54c08b0581d54a45da07f6022224747403f375c04c71aa0147ac83b7573a 
iPhone12,1 7.50 GBiPhone12,1_17.5.1_21F90_Restore.ipsw SHA-256 afe26e85376192a95c82c58f34dd304d552845a40d9ef1b8dfc3b9c8ae262351 
iPhone12,3 7.65 GBiPhone12,3,iPhone12,5_17.5.1_21F90_Restore.ipsw SHA-256 29b2bbf7ccce75d7f0bc60c9c4c7459559f4abf3012c0e0b080ec293187da14d 
iPhone12,5 7.65 GBiPhone12,3,iPhone12,5_17.5.1_21F90_Restore.ipsw SHA-256 29b2bbf7ccce75d7f0bc60c9c4c7459559f4abf3012c0e0b080ec293187da14d 
iPhone11,8 7.62 GBiPhone11,8_17.5.1_21F90_Restore.ipsw SHA-256 33708d1a45c05e9e078022956ea068c08005c6e8053e0f51954e4a20aa79848b 
iPhone11,2 7.80 GBiPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw SHA-256 7d7b7b30551530e4b95d3bdba9ac28e8a39ec1500bfe0674422cbfaabf68eb9e 
iPhone11,6 7.80 GBiPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw SHA-256 7d7b7b30551530e4b95d3bdba9ac28e8a39ec1500bfe0674422cbfaabf68eb9e 
iPhone11,4 7.80 GBiPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw SHA-256 7d7b7b30551530e4b95d3bdba9ac28e8a39ec1500bfe0674422cbfaabf68eb9e No device matches.
21F90How to install iOS 17.5.1 from the IPSW
Four steps, and the one that matters most is the first.
Back up first
A restore erases the device. Make an archived backup in Finder or the Apple Devices app — an iCloud backup taken on a newer version cannot be restored onto an older one. Our backup guide covers the difference.
Get the file for your exact model
Check Settings → General → About → Model Name, then download the IPSW for that device. The download shows the file size; compare it with the SHA-256 under Details if you want to be certain the file is intact.
Restore in Finder or Apple Devices
Connect with a cable, select the device, then hold Option (Mac) or Shift (Windows) and click Restore to choose the .ipsw. Update keeps your data but only works upward; Restore erases and is how you downgrade.
Set up or restore your backup
After the restore the device starts fresh. Restore the backup you made — only if it came from the same or an older version than the one you just installed.
Questions? Answers.
Can I restore iOS 17.5.1 today?
Not at the moment — Apple has stopped signing 21F90, so a restore will be rejected at the final step. The files remain here for reference and for signed re-releases.
Which is the right file for my device?
Match the identifier in Settings → General → About (or under the model's name here) against the one on each row. Wi-Fi and Cellular iPads share a file; different generations never do. Restoring the wrong device's IPSW simply fails — it cannot damage the device.
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.