The iPhone 6s was introduced in 2015, shipped in 16 GB, 32 GB, 64 GB and 128 GB configurations, was offered in Space gray, silver, gold and rose gold.
Device facts (year, capacities, colours) from Apple Support. Capacities and colours can vary by model and region.
iOS 15.8.8
- Identifier
- iPhone8,1
- Model Number
- A1633, A1688, A1700, A1691
- BuildID
- 19H422
- Release Date
- May 11, 2026
- Filesize
- 4.91 GB
- Filename
- iPhone_4.7_15.8.8_19H422_Restore.ipsw
- SHA256
- 906751cb5d10ebe666b3873496e5bd1c3ede0cabd26f3a4e10812602855a6ffd
- SHA1
- b8d93af9335b4182cf4ed5160cf4ca63e25d131a
- MD5
- 0328f97c064c06976b5f6a499f8deba1
- Download URL
-
This page covers everything Apple has published for the iPhone 6s (device identifier iPhone8,1).
Apple sells that device under several model numbers — A1633, A1688, A1700 and A1691 — which cover its regional and connectivity variants, and the firmware on this page works on all of them.
Before downloading, verify this is the correct device model:
- Go to Settings → General → About on your device
- Check that Model Number matches: A1633 or A1688 or A1700 or A1691
- Or verify that Model Name is: iPhone 6s
Make sure you select the correct model to avoid installation errors
Apple's firmware list for the iPhone 6s starts with iOS 9.0 (Sep 17, 2015) and currently ends with iOS 15.8.8 (May 12, 2026).
That is 116 releases in total, spanning 10 years 7 months between the first and the most recent build.
iOS 15.8.8 is still being signed by Apple, so it can be restored, reinstalled, or updated to with Finder, iTunes, or the Apple Devices app right away.
Every build Apple has published for this device is listed below with its original Apple download link, build ID, release date, and checksums, so an older release can still be verified or archived after Apple stops signing it.
Across that history the device has received 7 major iOS versions: iOS 9 (13 releases) , iOS 10 (11 releases) , iOS 11 (16 releases) , iOS 12 (13 releases) , iOS 13 (17 releases) , iOS 14 (14 releases) and iOS 15 (32 releases) .
Other models in the iPhone 6s family, each with its own firmware page.