Firmware/Apple Watch/4.x

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Apple Watch (1st generation)

Watch1,1

Version Build Keys Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch1,1 19 September 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch1,1 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch1,1 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch1,1 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch1,1 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch1,1 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch1,1 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch1,1 9 July 2018 Release Notes
Security Notes

Watch1,2

Version Build Keys Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch1,2 19 September 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch1,2 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch1,2 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch1,2 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch1,2 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch1,2 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch1,2 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch1,2 9 July 2018 Release Notes
Security Notes

Apple Watch Series 1

Watch2,6

Version Build Keys Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch2,6 19 September 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch2,6 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch2,6 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch2,6 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch2,6 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch2,6 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch2,6 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch2,6 9 July 2018 Release Notes
Security Notes

Watch2,7

Version Build Keys Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch2,7 19 September 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch2,7 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch2,7 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch2,7 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch2,7 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch2,7 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch2,7 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch2,7 9 July 2018 Release Notes
Security Notes

Apple Watch Series 2

Watch2,3

Version Build Keys Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch2,3 19 September 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch2,3 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch2,3 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch2,3 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch2,3 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch2,3 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch2,3 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch2,3 9 July 2018 Release Notes
Security Notes

Watch2,4

Version Build Keys Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch2,4 19 September 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch2,4 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch2,4 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch2,4 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch2,4 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch2,4 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch2,4 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch2,4 9 July 2018 Release Notes
Security Notes

Apple Watch Series 3

Watch3,1

Version Build Keys Baseband Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch3,1 ? 19 September 2017 Release Notes
Security Notes
4.0.1 11.0 15R654 Watch3,1 1.00.03 4 October 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch3,1 1.22.02 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch3,1 1.34.01 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch3,1 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch3,1 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch3,1 1.56.02 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch3,1 1.60.00 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch3,1 9 July 2018 Release Notes
Security Notes

Watch3,2

Version Build Keys Baseband Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch3,2 ? 19 September 2017 Release Notes
Security Notes
4.0.1 11.0 15R654 Watch3,2 1.00.03 4 October 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch3,2 1.22.02 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch3,2 1.34.01 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch3,2 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch3,2 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch3,2 1.56.02 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch3,2 1.60.00 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch3,2 9 July 2018 Release Notes
Security Notes

Watch3,3

Version Build Keys Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch3,3 19 September 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch3,3 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch3,3 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch3,3 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch3,3 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch3,3 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch3,3 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch3,3 9 July 2018 Release Notes
Security Notes

Watch3,4

Version Build Keys Release Date Release Notes
watchOS iOS
4.0 11.0 15R372 Watch3,4 19 September 2017 Release Notes
Security Notes
4.1 11.1 15R846 Watch3,4 31 October 2017 Release Notes
Security Notes
4.2 11.2 15S102 Watch3,4 5 December 2017 Release Notes
Security Notes
4.2.2 11.2.5 15S542 Watch3,4 23 January 2018 Release Notes
Security Notes
4.2.3 11.2.6 15S600b Watch3,4 19 February 2018 Release Notes
Security Notes
4.3 11.3 15T212 Watch3,4 29 March 2018 Release Notes
Security Notes
4.3.1 11.4 15T567 Watch3,4 29 May 2018 Release Notes
Security Notes
4.3.2 11.4.1 15U70 Watch3,4 9 July 2018 Release Notes
Security Notes