IPSW · iOS
iOS 17.2.1 IPSW Download (21C66)
Build 21C66, released December 19, 2023 — 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 7.94 GB
FilenameiPhone15,4_17.2.1_21C66_Restore.ipsw
SHA-2569edf3cd85b49d7855dcae45a9ac9811d9d7b8d8839aabd88392d4f955fe74407
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-15716/DAB13739-FDF4-40A6-A729-4EFC82A0DF48/iPhone15,4_17.2.1_21C66_Restore.ipsw
Size7,941,832,378 bytes (7.94 GB)
Unsigned
iPhone15,5 7.94 GB
FilenameiPhone15,5_17.2.1_21C66_Restore.ipsw
SHA-256d6a4d73b7cc090841c60782fe892041fc26b62294f6b3de6a3af322c5d0085a8
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-15804/7D49528D-F94A-4890-83E4-2394AF2C3711/iPhone15,5_17.2.1_21C66_Restore.ipsw
Size7,942,065,697 bytes (7.94 GB)
Unsigned
iPhone16,1 8.13 GB
FilenameiPhone16,1_17.2.1_21C66_Restore.ipsw
SHA-256c5855b65a804e267925bc569da8fb3477691fcb6f085613653798145453e99d5
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-18109/661DD240-3D1B-4CB3-BB47-168916048AC1/iPhone16,1_17.2.1_21C66_Restore.ipsw
Size8,126,093,897 bytes (8.13 GB)
Unsigned
iPhone16,2 8.13 GB
FilenameiPhone16,2_17.2.1_21C66_Restore.ipsw
SHA-2569cd3d719754b848f56b702fe8c9621458671d7fd590d0a6f674340e7fa83ac4f
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16033/52465E50-57AE-450C-9D0E-249C84A0379F/iPhone16,2_17.2.1_21C66_Restore.ipsw
Size8,128,149,239 bytes (8.13 GB)
Unsigned
iPhone14,8 7.76 GB
FilenameiPhone14,8_17.2.1_21C66_Restore.ipsw
SHA-256892c5967cedf0765573a13c8fd8e6febffce270d898ac2712e7f4d0595de7398
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-18384/C420427D-CD1A-4B99-ADC2-5A99D9AE4FBA/iPhone14,8_17.2.1_21C66_Restore.ipsw
Size7,757,894,575 bytes (7.76 GB)
Unsigned
iPhone14,7 7.76 GB
FilenameiPhone14,7_17.2.1_21C66_Restore.ipsw
SHA-2560397a3c0d46e52118883dbd4c2718baf8f4ba9135b5e9577ed14d59c64581f57
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-18151/7A1B65D2-D3AF-441F-B6C2-E98B8CD00586/iPhone14,7_17.2.1_21C66_Restore.ipsw
Size7,758,822,319 bytes (7.76 GB)
Unsigned
iPhone15,2 7.92 GB
FilenameiPhone15,2_17.2.1_21C66_Restore.ipsw
SHA-256567b36bf273186adcc60f2d2bd464f9e2b8f8661e9a6069ae9aefd24fb301a1f
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16092/DC604DF3-9E67-493B-8ABD-EF25D087555F/iPhone15,2_17.2.1_21C66_Restore.ipsw
Size7,918,973,653 bytes (7.92 GB)
Unsigned
iPhone15,3 7.90 GB
FilenameiPhone15,3_17.2.1_21C66_Restore.ipsw
SHA-256956f4a84ba1de91e9fdb8c4c3f6f2ad5adbefcc4217be62f67a889381258379a
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-18372/95D87F63-4AF4-429C-A739-BD7B5146CCB2/iPhone15,3_17.2.1_21C66_Restore.ipsw
Size7,898,088,383 bytes (7.90 GB)
Unsigned
iPhone14,6 7.50 GB
FilenameiPhone14,6_17.2.1_21C66_Restore.ipsw
SHA-2568026a07badd1eb96ef7c6c1d3765fe431e066112ad0abf23968432f793a345b1
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-15673/35D638DD-BF69-4F0E-BD54-62D485E2D36A/iPhone14,6_17.2.1_21C66_Restore.ipsw
Size7,495,315,054 bytes (7.50 GB)
Unsigned
iPhone14,5 7.71 GB
FilenameiPhone14,5_17.2.1_21C66_Restore.ipsw
SHA-256bb01ffdb242d93f7f6b562eb1bbe99361eef6e04e63de39d38bd3a41d51518a4
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-18339/6F8693F0-8708-4DE6-A45B-0B10AF698F95/iPhone14,5_17.2.1_21C66_Restore.ipsw
Size7,709,611,536 bytes (7.71 GB)
Unsigned
iPhone14,4 7.73 GB
FilenameiPhone14,4_17.2.1_21C66_Restore.ipsw
SHA-256cdd4af8bb9e323529e749e07329429ee32d711ce82b2428dc48fdaf58cc70771
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16899/2490D3C3-EF33-4B7D-9B56-B6F0D05F1466/iPhone14,4_17.2.1_21C66_Restore.ipsw
Size7,733,030,332 bytes (7.73 GB)
Unsigned
iPhone14,2 7.83 GB
FilenameiPhone14,2_17.2.1_21C66_Restore.ipsw
SHA-256dc4cc8d0cb488af4e09efb9ae8596f71a0f4ae7d28fa863415bb168211255067
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-15850/47EEB281-EEB2-4A12-B3B3-7A39E8107B0F/iPhone14,2_17.2.1_21C66_Restore.ipsw
Size7,831,964,624 bytes (7.83 GB)
Unsigned
iPhone14,3 7.83 GB
FilenameiPhone14,3_17.2.1_21C66_Restore.ipsw
SHA-2565afd010177feaee9f124244d33e32f74de2d22dd49b83b62c045c9f942129bca
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16852/F64B91DB-963C-4EAC-8698-8A561221BA41/iPhone14,3_17.2.1_21C66_Restore.ipsw
Size7,832,238,301 bytes (7.83 GB)
Unsigned
iPhone13,1 7.65 GB
FilenameiPhone13,1_17.2.1_21C66_Restore.ipsw
SHA-256cc5e9944ca9317a4001354a2502b1cc201e34e8470d91f92051a443f4e8b18e4
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16486/F41E8AB6-EC8C-4C0D-8BBB-1B65DF9AC0F5/iPhone13,1_17.2.1_21C66_Restore.ipsw
Size7,647,141,554 bytes (7.65 GB)
Unsigned
iPhone13,4 7.78 GB
FilenameiPhone13,4_17.2.1_21C66_Restore.ipsw
SHA-256e54c05c5a383ba9845713b057117e56d576fca3601d892f1f36ef635b050731e
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16650/3A67F509-F714-42C3-B5DC-DD1B16692833/iPhone13,4_17.2.1_21C66_Restore.ipsw
Size7,778,712,315 bytes (7.78 GB)
Unsigned
iPhone13,2 7.82 GB
FilenameiPhone13,2,iPhone13,3_17.2.1_21C66_Restore.ipsw
SHA-256b3ddf66aa83335df5aa5b1ef5d9a209fa50812c65ae173adc6e1630c8a0dc48d
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-17287/8DE762F4-557F-4F61-B8D3-08035639A548/iPhone13,2,iPhone13,3_17.2.1_21C66_Restore.ipsw
Size7,822,519,030 bytes (7.82 GB)
Unsigned
iPhone13,3 7.82 GB
FilenameiPhone13,2,iPhone13,3_17.2.1_21C66_Restore.ipsw
SHA-256b3ddf66aa83335df5aa5b1ef5d9a209fa50812c65ae173adc6e1630c8a0dc48d
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-17287/8DE762F4-557F-4F61-B8D3-08035639A548/iPhone13,2,iPhone13,3_17.2.1_21C66_Restore.ipsw
Size7,822,519,030 bytes (7.82 GB)
Unsigned
iPhone12,8 7.28 GB
FilenameiPhone12,8_17.2.1_21C66_Restore.ipsw
SHA-2561bbafd16778272a6fa66d208e8cc3c88e1e6dbc36d853916655e3f7a42c0d0a9
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16018/679DDF48-A97C-491C-B557-65D8D26B952B/iPhone12,8_17.2.1_21C66_Restore.ipsw
Size7,284,979,654 bytes (7.28 GB)
Unsigned
iPhone12,1 7.31 GB
FilenameiPhone12,1_17.2.1_21C66_Restore.ipsw
SHA-256ff373763bb1fe50fb7a19a7f1084c217336a173da9a27afcb72092f13858e937
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16061/C5B166A1-BA91-40BD-875E-EA889F68624F/iPhone12,1_17.2.1_21C66_Restore.ipsw
Size7,311,390,765 bytes (7.31 GB)
Unsigned
iPhone12,3 7.46 GB
FilenameiPhone12,3,iPhone12,5_17.2.1_21C66_Restore.ipsw
SHA-256e135107807517e6f60202a26806cf7ea7ee625b1bbbb59d8b966414af0ff92a5
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16372/1A685222-9235-4BF3-B467-A5E74424171C/iPhone12,3,iPhone12,5_17.2.1_21C66_Restore.ipsw
Size7,457,576,655 bytes (7.46 GB)
Unsigned
iPhone12,5 7.46 GB
FilenameiPhone12,3,iPhone12,5_17.2.1_21C66_Restore.ipsw
SHA-256e135107807517e6f60202a26806cf7ea7ee625b1bbbb59d8b966414af0ff92a5
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16372/1A685222-9235-4BF3-B467-A5E74424171C/iPhone12,3,iPhone12,5_17.2.1_21C66_Restore.ipsw
Size7,457,576,655 bytes (7.46 GB)
Unsigned
iPhone11,8 7.43 GB
FilenameiPhone11,8_17.2.1_21C66_Restore.ipsw
SHA-2564b375b50c57c48453bce38233598677346f9746382838f36d9662280b9482e2c
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16064/0E0BD75E-196C-4B1B-B593-7F9C5FB8F155/iPhone11,8_17.2.1_21C66_Restore.ipsw
Size7,433,465,876 bytes (7.43 GB)
Unsigned
iPhone11,2 7.61 GB
FilenameiPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw
SHA-256421fb0c427f623eebcc881dc540fdf350a5a477bab7de44cb46e48dbccaaef4c
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16313/0CB1A22E-2ED3-4021-B002-E8E324AD2458/iPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw
Size7,613,824,763 bytes (7.61 GB)
Unsigned
iPhone11,6 7.61 GB
FilenameiPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw
SHA-256421fb0c427f623eebcc881dc540fdf350a5a477bab7de44cb46e48dbccaaef4c
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16313/0CB1A22E-2ED3-4021-B002-E8E324AD2458/iPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw
Size7,613,824,763 bytes (7.61 GB)
Unsigned
iPhone11,4 7.61 GB
FilenameiPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw
SHA-256421fb0c427f623eebcc881dc540fdf350a5a477bab7de44cb46e48dbccaaef4c
Direct URLhttps://updates.cdn-apple.com/2023FallFCS/fullrestores/052-16313/0CB1A22E-2ED3-4021-B002-E8E324AD2458/iPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw
Size7,613,824,763 bytes (7.61 GB)
No device matches.
Version
iOS 17.2.1
Build
21C66Released
December 19, 2023
Channel
Public release
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iOS 16.7.4
Next
iOS 17.3 beta 2
How to install iOS 17.2.1 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 17.2.1 today?
Not at the moment — Apple has stopped signing 21C66, 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.