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.
Unsigned
iPhone15,4 8.09 GB
FilenameiPhone15,4_17.5.1_21F90_Restore.ipsw
SHA-256eaa1d9f7da8df40a2b1cf1394abd38cdbcd709fb854aea2f4a0a867e3d770f2b
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-06597/42663D3C-DD3F-45C1-9F2A-EF843EDA77EE/iPhone15,4_17.5.1_21F90_Restore.ipsw
Size8,091,103,811 bytes (8.09 GB)
Unsigned
iPhone15,5 8.09 GB
FilenameiPhone15,5_17.5.1_21F90_Restore.ipsw
SHA-2567ae65fa01f0e5c8b9681d50a78f6859300299714664cd8037c1293cd4441e408
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05177/3B31C72B-FE8B-4A3B-BEB1-CBF331FD3D15/iPhone15,5_17.5.1_21F90_Restore.ipsw
Size8,091,154,873 bytes (8.09 GB)
Unsigned
iPhone16,1 8.28 GB
FilenameiPhone16,1_17.5.1_21F90_Restore.ipsw
SHA-256f3c8cfaac1c636f661ecfc6e6483f2e73f25825d6a48290da2258015f946a3d2
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05727/A9973D55-7049-49B7-A01B-1F9D3A5B836A/iPhone16,1_17.5.1_21F90_Restore.ipsw
Size8,278,444,469 bytes (8.28 GB)
Unsigned
iPhone16,2 8.28 GB
FilenameiPhone16,2_17.5.1_21F90_Restore.ipsw
SHA-25689e1eed78fb37c96e5d98f0dbf9e1569ee63e83b05657226ace2f70df803cd14
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05185/BAE7DE43-0DFC-475A-9738-28B9E82E9B84/iPhone16,2_17.5.1_21F90_Restore.ipsw
Size8,279,609,583 bytes (8.28 GB)
Unsigned
iPhone14,8 7.94 GB
FilenameiPhone14,8_17.5.1_21F90_Restore.ipsw
SHA-25697f6c67e8b4d47228f2d5377ffc014250fd70838b1ae310c37f3a5a8f94b3155
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05739/445ED2B0-FBF5-4678-A36F-63C6139C1500/iPhone14,8_17.5.1_21F90_Restore.ipsw
Size7,944,223,761 bytes (7.94 GB)
Unsigned
iPhone14,7 7.95 GB
FilenameiPhone14,7_17.5.1_21F90_Restore.ipsw
SHA-256f1f4d4b7ebdea23ef54ac8342da6d02d09ca7cb5dcf845a337f5670c529e41d0
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05963/04FAFE16-8CB8-4F62-9521-BADF3FB996DF/iPhone14,7_17.5.1_21F90_Restore.ipsw
Size7,945,438,397 bytes (7.95 GB)
Unsigned
iPhone15,2 8.11 GB
FilenameiPhone15,2_17.5.1_21F90_Restore.ipsw
SHA-2567efbd595572cd8962fb6d1e284364b466883b0f739af7d248e878b14820713da
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-06652/B7EAA639-CB1A-4D5D-B4B4-11D4DCECFDE9/iPhone15,2_17.5.1_21F90_Restore.ipsw
Size8,106,785,134 bytes (8.11 GB)
Unsigned
iPhone15,3 8.09 GB
FilenameiPhone15,3_17.5.1_21F90_Restore.ipsw
SHA-256b7478f37a42f10d34f4a6c8318ec4f182db4dc6406aa4e04121aa7260464eb56
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05886/FC756113-6C74-42F7-9164-9F12FCF380C7/iPhone15,3_17.5.1_21F90_Restore.ipsw
Size8,086,660,169 bytes (8.09 GB)
Unsigned
iPhone14,6 7.68 GB
FilenameiPhone14,6_17.5.1_21F90_Restore.ipsw
SHA-2567ed003aa0d217fd16ee33dbc001e9c4cfb8ebb996e5d3f2ae25d3e4226cf65d4
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05447/B4F9EB2C-292B-4F9E-B0D3-2E4FCE8DE5E5/iPhone14,6_17.5.1_21F90_Restore.ipsw
Size7,675,216,830 bytes (7.68 GB)
Unsigned
iPhone14,5 7.89 GB
FilenameiPhone14,5_17.5.1_21F90_Restore.ipsw
SHA-2564bd80b30745f6a1d3238fd379e1dabaa05b43793c4d97f5d484f77fe3c817124
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-06371/7E9B4855-402C-4763-B748-6A4145AF65FE/iPhone14,5_17.5.1_21F90_Restore.ipsw
Size7,890,600,291 bytes (7.89 GB)
Unsigned
iPhone14,4 7.92 GB
FilenameiPhone14,4_17.5.1_21F90_Restore.ipsw
SHA-2563af8ce45cfcc475f4c7ca44a3e0a8bd59125c362f1a99d7c02d6fff2d062fc6b
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05928/0B57B372-CBD6-49CF-8725-40639A740EE6/iPhone14,4_17.5.1_21F90_Restore.ipsw
Size7,917,710,516 bytes (7.92 GB)
Unsigned
iPhone14,2 8.02 GB
FilenameiPhone14,2_17.5.1_21F90_Restore.ipsw
SHA-256bee7104f9016d0ea4531ae6e504f8d348daad16a977b5d139c16552315728304
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05098/F85BE9A3-604C-41F6-9DDA-2B5C8CB1F2AA/iPhone14,2_17.5.1_21F90_Restore.ipsw
Size8,016,482,790 bytes (8.02 GB)
Unsigned
iPhone14,3 8.02 GB
FilenameiPhone14,3_17.5.1_21F90_Restore.ipsw
SHA-2562b721ca9a419ebc03f81fddc4a630a9d7263c06db9dd98891c4e6f9d5ea47a4a
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05804/A42345ED-776A-41C6-BC3E-5527662394FB/iPhone14,3_17.5.1_21F90_Restore.ipsw
Size8,016,760,912 bytes (8.02 GB)
Unsigned
iPhone13,1 7.83 GB
FilenameiPhone13,1_17.5.1_21F90_Restore.ipsw
SHA-256028009de07cba3df0df16e754529ccee71e22a5a0131c9a76ff752c4160a358f
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-06156/6B4EB283-95C7-44DB-B851-3A735543DEE6/iPhone13,1_17.5.1_21F90_Restore.ipsw
Size7,830,962,297 bytes (7.83 GB)
Unsigned
iPhone13,4 7.96 GB
FilenameiPhone13,4_17.5.1_21F90_Restore.ipsw
SHA-256cc4e44492cd435b2abc5ad42ce01ed8541db8048c01a93bec1184992e4ce35c5
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05568/B25C6CE5-4735-43DC-BA56-39D3383F6EF2/iPhone13,4_17.5.1_21F90_Restore.ipsw
Size7,963,214,336 bytes (7.96 GB)
Unsigned
iPhone13,2 8.01 GB
FilenameiPhone13,2,iPhone13,3_17.5.1_21F90_Restore.ipsw
SHA-256c7cc6e2f04b98320810a1b680481778402d63829691bac20915cb952cc300a1d
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05159/0E6577BB-F828-4CA1-A021-07B9BD4C8D06/iPhone13,2,iPhone13,3_17.5.1_21F90_Restore.ipsw
Size8,009,080,417 bytes (8.01 GB)
Unsigned
iPhone13,3 8.01 GB
FilenameiPhone13,2,iPhone13,3_17.5.1_21F90_Restore.ipsw
SHA-256c7cc6e2f04b98320810a1b680481778402d63829691bac20915cb952cc300a1d
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05159/0E6577BB-F828-4CA1-A021-07B9BD4C8D06/iPhone13,2,iPhone13,3_17.5.1_21F90_Restore.ipsw
Size8,009,080,417 bytes (8.01 GB)
Unsigned
iPhone12,8 7.47 GB
FilenameiPhone12,8_17.5.1_21F90_Restore.ipsw
SHA-25655fb54c08b0581d54a45da07f6022224747403f375c04c71aa0147ac83b7573a
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-06546/56591BE6-8704-4363-88DC-200AFBF49D6C/iPhone12,8_17.5.1_21F90_Restore.ipsw
Size7,472,207,319 bytes (7.47 GB)
Unsigned
iPhone12,1 7.50 GB
FilenameiPhone12,1_17.5.1_21F90_Restore.ipsw
SHA-256afe26e85376192a95c82c58f34dd304d552845a40d9ef1b8dfc3b9c8ae262351
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-06007/E7544E3D-0276-4350-A1F6-1105E3E622FF/iPhone12,1_17.5.1_21F90_Restore.ipsw
Size7,497,475,536 bytes (7.50 GB)
Unsigned
iPhone12,3 7.65 GB
FilenameiPhone12,3,iPhone12,5_17.5.1_21F90_Restore.ipsw
SHA-25629b2bbf7ccce75d7f0bc60c9c4c7459559f4abf3012c0e0b080ec293187da14d
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05319/2851398B-473D-4E33-AC83-4225B298DE6A/iPhone12,3,iPhone12,5_17.5.1_21F90_Restore.ipsw
Size7,646,967,555 bytes (7.65 GB)
Unsigned
iPhone12,5 7.65 GB
FilenameiPhone12,3,iPhone12,5_17.5.1_21F90_Restore.ipsw
SHA-25629b2bbf7ccce75d7f0bc60c9c4c7459559f4abf3012c0e0b080ec293187da14d
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05319/2851398B-473D-4E33-AC83-4225B298DE6A/iPhone12,3,iPhone12,5_17.5.1_21F90_Restore.ipsw
Size7,646,967,555 bytes (7.65 GB)
Unsigned
iPhone11,8 7.62 GB
FilenameiPhone11,8_17.5.1_21F90_Restore.ipsw
SHA-25633708d1a45c05e9e078022956ea068c08005c6e8053e0f51954e4a20aa79848b
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05989/2A24F46A-E011-4B8A-80EA-6696B2CAB7A1/iPhone11,8_17.5.1_21F90_Restore.ipsw
Size7,618,606,318 bytes (7.62 GB)
Unsigned
iPhone11,2 7.80 GB
FilenameiPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw
SHA-2567d7b7b30551530e4b95d3bdba9ac28e8a39ec1500bfe0674422cbfaabf68eb9e
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05676/8B425011-253B-447F-8821-42F7B07BF5A2/iPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw
Size7,803,092,387 bytes (7.80 GB)
Unsigned
iPhone11,6 7.80 GB
FilenameiPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw
SHA-2567d7b7b30551530e4b95d3bdba9ac28e8a39ec1500bfe0674422cbfaabf68eb9e
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05676/8B425011-253B-447F-8821-42F7B07BF5A2/iPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw
Size7,803,092,387 bytes (7.80 GB)
Unsigned
iPhone11,4 7.80 GB
FilenameiPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw
SHA-2567d7b7b30551530e4b95d3bdba9ac28e8a39ec1500bfe0674422cbfaabf68eb9e
Direct URLhttps://updates.cdn-apple.com/2024SpringFCS/fullrestores/062-05676/8B425011-253B-447F-8821-42F7B07BF5A2/iPhone11,2,iPhone11,4,iPhone11,6_17.5.1_21F90_Restore.ipsw
Size7,803,092,387 bytes (7.80 GB)
No device matches.
Version
iOS 17.5.1
Build
21F90Released
May 20, 2024
Channel
Public release
Previous
iOS 17.5
Next
iOS 18.0 beta
How 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.