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.
iPhone15,4 7.94 GBiPhone15,4_17.2.1_21C66_Restore.ipsw SHA-256 9edf3cd85b49d7855dcae45a9ac9811d9d7b8d8839aabd88392d4f955fe74407 
iPhone15,5 7.94 GBiPhone15,5_17.2.1_21C66_Restore.ipsw SHA-256 d6a4d73b7cc090841c60782fe892041fc26b62294f6b3de6a3af322c5d0085a8 
iPhone16,1 8.13 GBiPhone16,1_17.2.1_21C66_Restore.ipsw SHA-256 c5855b65a804e267925bc569da8fb3477691fcb6f085613653798145453e99d5 
iPhone16,2 8.13 GBiPhone16,2_17.2.1_21C66_Restore.ipsw SHA-256 9cd3d719754b848f56b702fe8c9621458671d7fd590d0a6f674340e7fa83ac4f 
iPhone14,8 7.76 GBiPhone14,8_17.2.1_21C66_Restore.ipsw SHA-256 892c5967cedf0765573a13c8fd8e6febffce270d898ac2712e7f4d0595de7398 
iPhone14,7 7.76 GBiPhone14,7_17.2.1_21C66_Restore.ipsw SHA-256 0397a3c0d46e52118883dbd4c2718baf8f4ba9135b5e9577ed14d59c64581f57 
iPhone15,2 7.92 GBiPhone15,2_17.2.1_21C66_Restore.ipsw SHA-256 567b36bf273186adcc60f2d2bd464f9e2b8f8661e9a6069ae9aefd24fb301a1f 
iPhone15,3 7.90 GBiPhone15,3_17.2.1_21C66_Restore.ipsw SHA-256 956f4a84ba1de91e9fdb8c4c3f6f2ad5adbefcc4217be62f67a889381258379a 
iPhone14,6 7.50 GBiPhone14,6_17.2.1_21C66_Restore.ipsw SHA-256 8026a07badd1eb96ef7c6c1d3765fe431e066112ad0abf23968432f793a345b1 
iPhone14,5 7.71 GBiPhone14,5_17.2.1_21C66_Restore.ipsw SHA-256 bb01ffdb242d93f7f6b562eb1bbe99361eef6e04e63de39d38bd3a41d51518a4 
iPhone14,4 7.73 GBiPhone14,4_17.2.1_21C66_Restore.ipsw SHA-256 cdd4af8bb9e323529e749e07329429ee32d711ce82b2428dc48fdaf58cc70771 
iPhone14,2 7.83 GBiPhone14,2_17.2.1_21C66_Restore.ipsw SHA-256 dc4cc8d0cb488af4e09efb9ae8596f71a0f4ae7d28fa863415bb168211255067 
iPhone14,3 7.83 GBiPhone14,3_17.2.1_21C66_Restore.ipsw SHA-256 5afd010177feaee9f124244d33e32f74de2d22dd49b83b62c045c9f942129bca 
iPhone13,1 7.65 GBiPhone13,1_17.2.1_21C66_Restore.ipsw SHA-256 cc5e9944ca9317a4001354a2502b1cc201e34e8470d91f92051a443f4e8b18e4 
iPhone13,4 7.78 GBiPhone13,4_17.2.1_21C66_Restore.ipsw SHA-256 e54c05c5a383ba9845713b057117e56d576fca3601d892f1f36ef635b050731e 
iPhone13,2 7.82 GBiPhone13,2,iPhone13,3_17.2.1_21C66_Restore.ipsw SHA-256 b3ddf66aa83335df5aa5b1ef5d9a209fa50812c65ae173adc6e1630c8a0dc48d 
iPhone13,3 7.82 GBiPhone13,2,iPhone13,3_17.2.1_21C66_Restore.ipsw SHA-256 b3ddf66aa83335df5aa5b1ef5d9a209fa50812c65ae173adc6e1630c8a0dc48d 
iPhone12,8 7.28 GBiPhone12,8_17.2.1_21C66_Restore.ipsw SHA-256 1bbafd16778272a6fa66d208e8cc3c88e1e6dbc36d853916655e3f7a42c0d0a9 
iPhone12,1 7.31 GBiPhone12,1_17.2.1_21C66_Restore.ipsw SHA-256 ff373763bb1fe50fb7a19a7f1084c217336a173da9a27afcb72092f13858e937 
iPhone12,3 7.46 GBiPhone12,3,iPhone12,5_17.2.1_21C66_Restore.ipsw SHA-256 e135107807517e6f60202a26806cf7ea7ee625b1bbbb59d8b966414af0ff92a5 
iPhone12,5 7.46 GBiPhone12,3,iPhone12,5_17.2.1_21C66_Restore.ipsw SHA-256 e135107807517e6f60202a26806cf7ea7ee625b1bbbb59d8b966414af0ff92a5 
iPhone11,8 7.43 GBiPhone11,8_17.2.1_21C66_Restore.ipsw SHA-256 4b375b50c57c48453bce38233598677346f9746382838f36d9662280b9482e2c 
iPhone11,2 7.61 GBiPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw SHA-256 421fb0c427f623eebcc881dc540fdf350a5a477bab7de44cb46e48dbccaaef4c 
iPhone11,6 7.61 GBiPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw SHA-256 421fb0c427f623eebcc881dc540fdf350a5a477bab7de44cb46e48dbccaaef4c 
iPhone11,4 7.61 GBiPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw SHA-256 421fb0c427f623eebcc881dc540fdf350a5a477bab7de44cb46e48dbccaaef4c No device matches.
21C66How 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.