OTA Updates/Apple Watch/2.1

Apple Watch (1st generation)

watchOS "1.0" and "1.0.1" are marketing versions; their true OS versions were 8.2 and 8.2.1, respectively. Since the OS version and marketing version now match as of watchOS 2.0, a fake OS version of 9.0 is specified for devices on watchOS 1.0 or 1.0.1 (watchOS 9.0 became reality in 2022).

Watch1,1

Version	Build	Prerequisite Version	Prerequisite Build	Compatibility Version	Release Date	OTA Download URL	File Size
2.1	13S661	8.2	12S507	5	8 December 2015	ba52c2b25e94127bc41562af1a545522af9677c3.zip	556,810,035
		8.2.1	12S632	5		254484fe33294fbc9b359cfdb3d4e425c33edc33.zip	550,558,222
		2.0	13S344	5		1f0f8ececb8eb6a67c8e8fe5a4be7f813103d579.zip	84,812,161
		2.0.1	13S428	5		dd42b504aa8bf988d7a7c7e2aa878e877391b0cf.zip	59,810,320
		2.0 beta	13S5254w	5		1818b54e396fe38d2a0a295348b0c23590bda46f.zip	424,163,269
		2.0 beta 2	13S5255c	5		62128fd0455a1ce29cdfff22b984ac70f2b6e9bc.zip	424,136,063
		2.0 beta 3	13S5255d	5		a44c8975dd25d749bb30540d48170fd1f80f6825.zip	424,141,314
		2.0 beta 4	13S5293f	5		c396d9c4a967ce57dae685ca0c193da2a8236bc7.zip	324,808,318
		2.0 beta 5	13S5305d	5		b1cc50192f4b0943b15a9988dff8622f1e0d9350.zip	282,482,897
		2.0 beta 6	13S5325c	5		eec852023102ee52679b18a8a853116961a21ad4.zip	216,402,234

Watch1,2

Version	Build	Prerequisite Version	Prerequisite Build	Compatibility Version	Release Date	OTA Download URL	File Size
2.1	13S661	8.2	12S507	?	8 December 2015	9abab0ed1d522f72672faf7452ab2274a65fdb7b.zip	554,769,394
		8.2.1	12S632			3977e84b9c0cf3d212fab658f99d154022544881.zip	548,505,580
		2.0	13S344			ce240d60b92d6f02c09dceb6a820a9d355d5447a.zip	84,839,855
		2.0.1	13S428			df046ad4a431b1ce22579cca4de228a3e3c24847.zip	59,863,857