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SHSH
As the SHSH blob article on Wikipedia summarizes it: "SHSH blob is a jargon term for a small piece of data that is part of Apple's digital signature protocol for iOS restores and updates, designed to control the iOS versions that users can install on their iOS devices (iPhones, iPads, iPod touches, and Apple TVs), generally only allowing the newest iOS version to be installable. "
Technically, the SHSH of a firmware image is a 1024-bit (0x80 bytes) RSA signature. This often also refers to backup files with the signature ("SHSH blobs"). This signature is needed to restore a specific iOS version; it is generated by Apple based on hardware keys of the device and the hash of the firmware. Apple only issues signatures for the currently-available iOS version, which disallows installing older iOS versions. But if you have saved signatures for an older iOS version, you may be able to use a replay attack to restore that version. Therefore it is recommended to save the signature for your device as long as Apple issues it.
With the tools mentioned below it is possible to backup the signature. It is not necessary that the device is jailbroken to do the backup. Usually the SHSH signature file is stored on Saurik's server. If it is stored there, then you can see in the top of Cydia (on jailbroken devices) for which version a backup exists. This moved to TSS Center which can be located on the main page and then they are shown at the top of that.
Users often misunderstand this system and think that the SHSH firmware version they back up depends on the firmware version they have installed on their device. This is the case for iFaith, but not for TinyUmbrella. iFaith dumps the SHSHs from your device's storage (whatever's installed on your device, e.g. 4.3.3), while TinyUmbrella gets SHSHs from Apple's servers (whatever firmwares Apple is currently signing).
Using SHSH
Older devices allow installation of any correctly signed firmware, so no backup of the certificate is necessary. Devices that need Apple signatures are: iPhone 3GS (new Bootrom), iPhone 4, iPod touch 3G, iPad, iPad 2, iPod touch 4G, Apple TV 2G and all newer devices. The iPhone 3G, iPhone 3GS Old Bootrom and iPod touch 2G bootroms do not require these SHSHs; however, newer versions of iOS require them (unless the chain of trust is broken and custom firmwares are installed). To restore to arbitrary versions of iOS 4.0, the SHSH is also needed for the iPod touch 2G and iPhone 3G. not only does DFU Mode require the iBSS/iBEC files to be signed with an SHSH that includes the device's ECID, but the normal boot-chain requires the LLB to be fully signed with an ECID+SHSH, so a downgrade IPSW is not possible without a bootrom exploit of normal boot-chain (e.g. 0x24000 Segment Overflow). See also the Dev Team Blog post about this.
To restore to iOS 3.x or 4.x, change your hosts file to map any request to an Apple server to point to saurik's server instead, if your device's signatures are hosted there. If you have the signature file on your computer, run TinyUmbrella's TSS Server on your local machine.
Since the limera1n Exploit is fixed in the bootrom since version Bootrom 838.3 and because iOS since 5.0 includes a nonce in their SHSH hashes, downgrading newer devices (iPhone 4S, iPad 2, iPad 3, Apple TV 3G) to earlier 5.x firmwares is not as simple. To restore to iOS 5.x on older devices, stitch iOS 5.x blobs into custom firmware (using redsn0w for example) and restore with that firmware. To restore to iOS 5.x on newer devices, use redsn0w's restore method. See the JailbreakQA guide to restoring to iOS 5.x using SHSH blobs (for all devices that can run iOS 5.x except Apple TV 3G).
Timeline
The original iPhone and iPod touch didn't use SHSH blobs.
| Firmware | For Device(s) | From | Until | Status |
|---|---|---|---|---|
| 3.0 | iPhone 3GS | 19 June 2009 | 9 September 2009 | Closed |
| 3.0.1 | 31 July 2009 | Closed | ||
| 3.1 | 9 September 2009 | 8 October 2009 | Closed | |
| 3.1.1 (7C145) | iPod touch 2G | 9 September 2009 | 21 June 2010 | Closed |
| iPod touch 3G | 9 September 2009 | 8 October 2009 | Closed | |
| 3.1.1 (7C146) | 17 September 2009 | 8 October 2009 (?) | Closed | |
| 3.1.2 | iPod touch 2G | 8 October 2009 | 21 June 2010 | Closed |
| iPhone 3GS, iPod touch 3G | 8 October 2009 | 2 February 2010 | Closed | |
| 3.1.3 | iPhone 3GS, iPod touch 2G, iPod touch 3G | 2 February 2010 | 21 June 2010 | Closed |
| 3.2 | iPad | 3 April 2010 | 15 July 2010 | Closed |
| 3.2.1 | 15 July 2010 | 19 August 2010 | Closed | |
| 3.2.2 | 11 August 2010 | 2 December 2010 (?) | Closed | |
| 4.0 | iPod touch 2G | 21 June 2010 | 9 September 2010 | Closed |
| iPod touch 3G | 21 June 2010 | 9 August 2010 | Closed | |
| iPhone 3G, iPhone 3GS | 21 June 2010 | 15 July 2010 | Closed | |
| iPhone 4 (iPhone3,1) | 24 June 2010 | 15 July 2010 | Closed | |
| 4.0.1 | iPhone 3G | 15 July 2010 | 9 September 2010 | Closed |
| iPhone 3GS, iPhone 4 (iPhone3,1) | 15 July 2010 | 19 August 2010 | Closed | |
| 4.0.2 | iPhone 3G, iPod touch 2G | 11 August 2010 | 18 September 2010 | Closed |
| iPhone 3GS, iPhone 4 (iPhone3,1), iPod touch 3G | 11 August 2010 | 9 September 2010 | Closed | |
| 4.1 (8B117) | iPhone 4 (iPhone3,1), iPod touch 4G | 8 September 2010 | 2 December 2010 (?) | Closed |
| iPhone 3G, iPhone 3GS, iPod touch 2G, iPod touch 3G | - | Open | ||
| 4.1 (8B118) | iPod touch 4G | 21 September 2010 | 2 December 2010 (?) | Closed |
| 4.2.1 | iPad, iPhone 3GS, iPhone 4 (iPhone3,1), iPod touch 3G, iPod touch 4G | 22 November 2010 | 11 March 2011 | Closed |
| iPhone 3G, iPod touch 2G | - | Open | ||
| 4.2.6 | iPhone 4 (iPhone3,3) | 1 February 2011 | 19 April 2011 (?) | Closed |
| 4.2.7 | 14 April 2011 | 6 May 2011 | Closed | |
| 4.2.8 | 4 May 2011 | 18 July 2011 | Closed | |
| 4.2.9 | 15 July 2011 | 27 July 2011 | Closed | |
| 4.2.10 | 25 July 2011 | 18 October 2011 | Closed | |
| 4.3 | iPad, iPad 2, iPhone 3GS, iPhone 4(iPhone3,1), iPod touch 3G, iPod touch 4G | 9 March 2011 | 27 March 2011 (?) | Closed |
| 4.3.1 | 25 March 2011 | 19 April 2011 (?) | Closed | |
| 4.3.2 | 14 April 2011 | 6 May 2011 | Closed | |
| 4.3.3 | 4 May 2011 | 18 July 2011 | Closed | |
| 4.3.4 | 15 July 2011 | 27 July 2011 | Closed | |
| 4.3.5 | 25 July 2011 | 18 October 2011 | Closed | |
| 5.0 | iPad, iPad 2, iPhone 3GS, iPhone 4, iPod touch 3G, iPod touch 4G | 4 October 2011 | 10 November 2011(?) | Closed |
| iPhone 4S | 14 October 2011 | 10 November 2011(?) | Closed | |
| 5.0.1 | iPad, iPad 2, iPhone 3GS, iPhone 4, iPhone 4S, iPod touch 3G, iPod touch 4G | 9 November 2011 | 8 February 2012 | Closed |
| 5.1 | iPad, iPad 2, iPad 3, iPhone 3GS, iPhone 4, iPhone 4S, iPod touch 3G, iPod touch 4G | 7 March 2012 | 14 May 2012 | Closed |
| 5.1.1 (9B206) | iPad 2, iPad 3, iPhone 3GS, iPhone 4, iPhone 4S, iPod touch 4G | 7 May 2012 | 21 September 2012 | Closed |
| iPad, iPod touch 3G | - | Open | ||
| 5.1.1 (9B208) | iPhone 4 (iPhone3,1) | 25 May 2012 | 21 September 2012 | Closed |
| 6.0 | iPad 2, iPad 3, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch 4G, iPod touch 5G | 19 September 2012 | 1 November 2012 | Closed |
| iPad 2, iPad 3, iPad mini (iPad2,5), iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch 4G, iPod touch 5G | 26 July 2013 | 26 July 2013 | Closed | |
| iPad 4 (iPad3,4), iPad mini (iPad2,5) | 30 October 2012 | 1 November 2012 | Closed | |
| 6.0.1 | iPad 2, iPad 3, iPad 4, iPad mini, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch 4G, iPod touch 5G | 1 November 2012 | 28 January 2013 | Closed |
| iPad 4, iPad mini | 9 November 2012 | 28 January 2013 | Closed | |
| iPad mini | 1 November 2012 | 8 January 2013 | Closed | |
| iPad 2, iPad 3, iPad 4 (iPad3,4), iPad mini (iPad2,5), iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch 4G, iPod touch 5G | 26 July 2013 | 26 July 2013 | Closed | |
| 6.0.2 | iPad mini, iPhone 5 | 18 December 2012 | 28 January 2013 | Closed |
| iPad mini (iPad2,5), iPhone 5 | 26 July 2013 | 26 July 2013 | Closed | |
| 6.1 | iPad 2, iPad 3, iPad 4, iPad mini, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch 5G | 28 January 2013 | 19 February 2013 | Closed |
| iPad mini (iPad2,6), iPod touch 4G | 28 January 2013 | 20 March 2013 | Closed | |
| 6.1.1 | iPhone 4S | 11 February 2013 | 19 February 2013 | Closed |
| 6.1.2 | iPad 2, iPad 3, iPad 4, iPad mini iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPod touch 4G | 19 February 2013 | 19 March 2013 | Closed |
| iPod touch 5G | 20 March 2013 | Closed | ||
| 6.1.3 | iPad 2, iPad 3, iPad 4, iPad mini (iPad2,5), iPad mini (iPad2,7), iPhone 4, iPhone 4S, iPod touch 5G | 19 March 2013 | 20 September 2013 | Closed |
| iPad mini (iPad2,6) | 25 September 2013 | Closed | ||
| iPhone 5 | 2 May 2013 | Closed | ||
| iPod touch 4G | 14 November 2013 | Closed | ||
| iPhone 3GS | 21 February 2014 | Closed | ||
| 6.1.4 | iPhone 5 | 2 May 2013 | 20 September 2013 | Closed |
| 6.1.5 | iPod touch 4 | 24 September 2013 | 21 February 2014 | Closed |
| 6.1.6 | iPhone 3GS, iPod touch 4G | 24 November 2013 | - | Open |
| 7.0 | iPad 2, iPad 3, iPad 4, iPad mini, iPhone 4, iPhone 4S, iPhone 5, iPod touch 5G | 18 September 2013 | 7 October 2013 | Closed |
| 7.0.1 | iPhone 5c, iPhone 5s | 18 September 2013 | 7 October 2013 | Closed |
| 7.0.2 | iPad 2, iPad 3, iPad 4, iPad mini (iPad2,6), iPad mini (iPad2,7), iPhone 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPod touch 5G | 26 September 2013 | 29 October 2013 | Closed |
| iPad mini (iPad2,5) | 21 February 2014 | Closed | ||
| 7.0.3 | iPad 2, iPad 3, iPad 4, iPad Air, iPad mini, iPad mini 2, iPhone 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPod touch 5G | 22 October 2013 | 14 November 2013 | Closed |
| 7.0.4 | 14 November 2013 | 21 February 2014 | Closed | |
| 7.0.5 | iPhone 5c (iPhone5,4), iPhone 5s (iPhone6,2) | 29 January 2014 | 21 February 2014 | Closed |
| 7.0.6 | iPad 2, iPad 3, iPad 4, iPad Air, iPad mini, iPad mini 2, iPhone 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPod touch 5G | 21 February 2014 | 10 March 2014 | Closed |
| 7.1 | 10 March 2014 | 30 April 2014 | Closed | |
| 7.1.1 | 22 April 2014 | 12 August 2014 | Closed | |
| 7.1.2 | iPad 2, iPad 3, iPad 4, iPad Air, iPad mini, iPad mini 2, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPod touch 5G | 30 June 2014 | 26 September 2014 | Closed |
| iPhone 4 | - | Open | ||
| 8.0 | iPad 2, iPad 3, iPad 4, iPad Air, iPad mini, iPad mini 2, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPod touch 5G | 17 September 2014 | 22 October 2014 | Closed |
| 8.0.1 | 24 September 2014 | 24 September 2014 | Closed | |
| 8.0.2 | 25 September 2014 | 20 October 2014 | Closed | |
| 8.1 | iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad mini, iPad mini 2, iPad mini 3, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPod touch 5G | 20 October 2014 | 1 December 2014 | Closed |
| 8.1.1 | 17 November 2014 | 17 December 2014 | Closed | |
| 8.1.2 | 9 December 2014 | 10 February 2015 | Closed | |
| 8.1.3 | 27 January 2015 | 23 March 2015 | Closed | |
| 8.2 | 9 March 2015 | 4 May 2015 | Closed | |
| 8.3 | 8 April 2015 | 7 July 2015 | Closed | |
| 8.4 | 30 June 2015 | 23 August 2015 | Closed | |
| iPod touch 6G | 15 July 2015 | 23 August 2015 | Closed | |
| 8.4.1 | iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad mini, iPad mini 2, iPad mini 3, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPod touch 5G, iPod touch 6G | 13 August 2015 | 30 September 2015 | Closed |
| 9.0 | iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad mini, iPad mini 2, iPad mini 3, iPad mini 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPod touch 5G, iPod touch 6G | 16 September 2015 | Closed | |
| 9.0.1 | iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad mini, iPad mini 2, iPad mini 3, iPad mini 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPod touch 5G, iPod touch 6G | 23 September 2015 | 8 October 2015 | Closed |
| iPhone 6s, iPhone 6s Plus | 24 September 2015 | Closed | ||
| 9.0.2 | iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad mini, iPad mini 2, iPad mini 3, iPad mini 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPod touch 5G, iPod touch 6G | 30 September 2015 | 29 October 2015 | Closed |
| 9.1 (13B143) | iPad Pro | 21 October 2015 | 2 December 2015 | Closed |
| iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad mini, iPad mini 2, iPad mini 3, iPad mini 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPod touch 5G, iPod touch 6G | 21 December 2015 | Closed | ||
| 9.1 (13B144) | iPad Pro (12.9 inch) | 17 November 2015 | Closed | |
| 9.2 | iPad 2 (iPad2,4), iPad 3 (iPad3,1), iPad 4, iPad Air, iPad Air 2, iPad Pro (12.9 inch), iPad mini, iPad mini 2, iPad mini 3, iPad mini 4, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPod touch 5G, iPod touch 6G | 8 December 2015 | 5 February 2016 | Closed |
| iPad 2 (iPad2,1), iPad 2 (iPad2,2), iPad 2 (iPad2,3), iPad 3 (iPad3,2), iPad 3 (iPad3,3), iPhone 4S | 4 February 2016 | Closed | ||
| 9.2.1 (13D15) | iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad Pro (12.9 inch), iPad mini, iPad mini 2, iPad mini 3, iPad mini 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPod touch 5G, iPod touch 6G | 19 January 2016 | 5 April 2016 | Closed |
| 9.2.1 (13D20) | iPad Air 2, iPad Pro (12.9 inch), iPad mini 3, iPad mini 4, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus | 18 February 2016 | 5 April 2016 | Closed |
| 9.3 (13E233) | iPad 2, iPad 3, iPad 4, iPad Air, iPad mini, iPad mini 2, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPod touch 5G | 21 March 2016 | 24 March 2016 | Closed |
| iPad Air 2, iPad Pro (12.9 inch), iPad mini 3, iPad mini 4, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPod touch 6G | 21 March 2016 | 18 April 2016 | Closed | |
| 9.3 (13E234) | iPad Pro (9.7 inch) | Closed | ||
| 9.3 (13E236) | iPad 2 (iPad2,2) | 25 March 2016 | 22 April 2016 | Closed |
| 9.3 (13E237) | iPad 2 (iPad2,1), iPad 2 (iPad2,3), iPad 2 (iPad2,4), iPad 3, iPad 4, iPad Air, iPad mini, iPad mini 2, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPod touch 5G | 28 March 2016 | Closed | |
| 9.3.1 | iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad Pro (12.9 inch), iPad Pro (9.7 inch), iPad mini, iPad mini 2, iPad mini 3, iPad mini 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPod touch 5G, iPod touch 6G | 31 March 2016 | - | Open |
| 9.3.2 (13F69) | iPad 2, iPad 3, iPad 4, iPad Air, iPad Air 2, iPad Pro (12.9 inch), iPad Pro (iPad6,4), iPad mini, iPad mini 2, iPad mini 3, iPad mini 4, iPhone 4S, iPhone 5, iPhone 5c, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPod touch 5G, iPod touch 6G | 16 May 2016 | - | Open |
| iPad Pro (iPad6,3) | 26 May 2016 | Closed | ||
| 9.3.2 (13F72) | iPad Pro (9.7 inch) | 2 June 2016 | - | Open |
Apple TV
| Marketing Version | OS Version | For Device(s) | From | Until | Status |
|---|---|---|---|---|---|
| 4.0 | 4.1 | Apple TV 2G | 29 September 2010 | 2 December 2010 (?) | Closed |
| 4.1 | 4.2 | 22 November 2010 | 14 December 2010 | Closed | |
| 4.1.1 | 4.2.1 | 14 December 2010 | 28 May 2011 (?) | Closed | |
| 4.2 | 4.3 | 9 March 2011 | 22 March 2011 (?) | Closed | |
| 4.2.1 | 22 March 2011 | 28 May 2011 (?) | Closed | ||
| 4.2.2 | 11 May 2011 | 18 October 2011 (?) | Closed | ||
| 4.3 | 9 March 2011 | ? | Closed | ||
| 4.4 | 5.0 | 4 October 2011 | ? | Closed | |
| 4.4.1 | 17 October 2011 | ? | Closed | ||
| 4.4.2 | 24 October 2011 | 11 January 2012(?) | Closed | ||
| 4.4.3 | 5.0.1 | 17 November 2011 | 11 January 2012(?) | Closed | |
| 4.4.4 | 15 December 2011 | 8 March 2012 | Closed | ||
| 5.0 | 5.1 | Apple TV 2G, Apple TV 3G (AppleTV3,1) | 7 March 2012 | 14 May 2012 | Closed |
| 5.0.1 | 5.1.1 | 10 May 2012 | July 2012 (day unknown) | Closed | |
| 5.0.2 | 5 June 2012 | 20 March 2013 | Closed | ||
| 5.1 | 6.0 | 24 September 2012 | 20 March 2013 | Closed | |
| 5.1.1 | 6.0.1 | 26 November 2012 | 20 March 2013 | Closed | |
| 5.2 | 6.1 | Apple TV 2G, Apple TV 3G | 28 January 2013 | 20 March 2013 | Closed |
| 5.2.1 | 6.1.3 | 19 March 2013 | 20 June 2013 | Closed | |
| 5.3 | 6.1.4 | Apple TV 2G, Apple TV 3G (AppleTV3,1) | 19 June 2013 | - | Open |
| Apple TV 3G (AppleTV3,2) | 19 June 2013 | 21 September 2013 | Closed | ||
| 6.0 | 7.0.1 | Apple TV 2G, Apple TV 3G | 20 September 2013 | 24 September 2013 | Closed |
| 7.0.2 | 24 September 2013 | 29 October 2013 | Closed | ||
| 6.0.1 | 7.0.3 | 24 October 2013 | 14 November 2013 | Closed | |
| 6.0.2 | 7.0.4 | 14 November 2013 | 21 February 2014 | Closed | |
| 7.0.6 | 21 February 2014 | 10 March 2014 | Closed | ||
| 6.1 | 7.1 | 10 March 2014 | 30 April 2014 | Closed | |
| 6.1.1 | 7.1.1 | 22 April 2014 | 11 July 2014 | Closed | |
| 6.2 | 7.1.2 | 30 June 2014 | 26 September 2014 | Closed | |
| 6.2.1 | Apple TV 2G | 17 September 2014 | - | Open | |
| 7.0 | 8.0 | Apple TV 3G | 17 September 2014 | 22 October 2014 | Closed |
| 7.0.1 | 8.1 | 20 October 2014 | 1 December 2014 | Closed | |
| 7.0.2 | 8.1.1 | 17 November 2014 | 1 April 2015 | Closed | |
| 7.0.3 | 8.1.3 | 27 January 2015 | 23 March 2015 | Closed | |
| 7.1 | 8.2 | 9 March 2015 | 4 May 2015 | Closed | |
| 7.2 | 8.3 | 8 April 2015 | 7 April 2016 | Closed | |
| 7.2.1 | 8.4.1 | 25 February 2016 | - | Open | |
| N/A | 9.0 | Apple TV 4G | 29 October 2015 | 14 December 2015 | Closed |
| 9.0.1 | 9 November 2015 | 21 December 2015 | Closed | ||
| 9.1 | 8 December 2015 | 4 February 2016 | Closed | ||
| 9.1.1 | 25 January 2016 | 5 April 2016 | Closed | ||
| 9.2 | 21 March 2016 | - | Open | ||
| 9.2.1 | 16 May 2016 | - | Open |
Protocol
To request a SHSH blob from Apple, a simple HTTP request can be made. For a full description, see the separate articles SHSH Protocol and Baseband SHSH Protocol.
