This is a documented list of known NonUI builds, used by Apple workers in California to do engineering tests on prototype devices and also by factory workers on production devices during manufacturing. These "factory firmwares" are based on production iOS firmware, but are adapted for internal engineering tests, development and debugging.

"Skankwerk" logo on 7.x and up

The name "NonUI" (Non-User Interface) refers to how a majority of applications in these builds are accessible via command line interace. The applications which do use a graphical user interface can be launched through SwitchBoard, a minimal version of SpringBoard. Unlike production iOS firmwares, factory firmwares have the following differences:

DEVELOPMENT fused bootloaders in \Firmware\dfu\ and \Firmware\all_flash\all_flash.[board codename].factory[fa/sa]\.
FACTORY fused SEP firmware in \Firmware\all_flash\all_flash.[board codename].factory[fa/sa]\
DEVELOPMENT fused kernelcache with more symbols (located in /System/Library/Caches/com.apple.kernelcaches on the filesystem), and with individual kexts in /System/Library/Extensions.
DEVELOPMENT dyld_shared_cache in /System/Library/Caches/com.apple.dyld.
DEBUG fused baseband firmware in \Firmware\.
Skankwerk (gear) logo image file in \Firmware\all_flash\all_flash.[board codename].factoryfa\.
/AppleInternal folder, which the hierarchy inside get priority over hierarchy in /.
No SpringBoard, requires the use of daemons to launch SwitchBoard.app as a multi-app launcher instead.
/usr and subfolders contain many UNIX command line utilities.
SSH daemon is pre-installed as dropbear, can be connected to over usb
Boot loader passes arguments to kernel (unlike RELEASE boot loaders as of iOS 5.0) which makes it easy to disable AMFI
It has some additional Private Frameworks in /System/Library/PrivateFrameworks for internal GUI apps and command line utilities.
Most internal applications require the use of SkankKit (replacement for UIKit in nonUI firmwares) to produce special layers such as text on the framebuffer.

Factory firmwares are distributed via internal "restore bundles", which can only be restored on devices using internal restore software such as PurpleRestore. Release and factory firmware "restore bundles" have the same directory structure (bootloaders, kernel, restore ramdisk, update ramdisk and root filesystem), but can also include other files specific to internal development builds of iOS.

"Skankwerk" logo on 6.x and below
A production iPhone 13 Pro Max displaying the Skankwerk firmware icon, recreated using an extracted graphic.
Production iPhone 3GS showing older Skankwerk logo during boot

Some interesting facts about factory firmwares[edit source]

Design: Apple seems to use the same GUI design from the production firmware to the factory one.

Production iOS 1.x to 6.x skeuomorphism design is also present on 1.x to 6.x factory firmwares, but seems really more excessive than production ones. For example, the "skankwerk" boot logo represents a real gear and many GUI icons are realistic or simply photos of real life things (especially in Operator). For newer versions, production iOS 7.x to 9.x flat design is mostly used in 7.x to 9.x factory firmwares. For example, the new "skankwerk" boot logo is a flat, simple white gear. Some newer internal applications like Earthbound also use a "flat" design.

Other: The "skank" word is used to name multiple elements of factory firmwares. For example, there is "skankphone", "skankbattery" (the green battery shown in SwitchBoard), "skankwerk" logo, "skankkit" framework, "purpleskank" (used by BurnIn) and most likely others. The "skank" word seems to be a reference to "Skunkworks" projects, which are secrecy projects that are usually innovative. Read more about "Skunkworks" on Wikipedia.

iPhones[edit source]

iPhone[edit source]

Version	Build	Codename	Baseband	Comments
1.0	1A420	Alpine	03.06.01_G^[1]	Originally posted to MacRumors
1.0	4A57		04.02.13_G	-
1.1.1	3A109f		?	-
1.1.2	3B48		04.02.13_G	-
1.1.3	4A93		?	From @mcg29_ on Twitter
1.1.4	4A102a		04.04.05_G	-

iPhone 3G[edit source]

Version	Build	Codename	Baseband	Comments
2.0.2	5C274a	BigBear	?	-
4.0	8A2180g	05.12.01	ApexNanshan	-

iPhone 3GS[edit source]

Version	Build	Codename	Baseband	Comments
3.0	7A2168d	Kirkwood?	?	From @1nsane_dev on Twitter
3.1b	7C108b	Sierra?	?	-
4.0	8A133	Apex	?	-
4.0	8A2180g	ApexNanshan	05.12.01	-
5.1	9B3176n	HoodooYabuli	05.16.05	-
6.0	10A316	Sundance	05.16.06	-

iPhone 4[edit source]

Version	Build	Codename	Baseband	Comments
4.0	8A133	Apex?	01.32.01	-
	8A2062a	Apex?	?	-
	8A2130h	ApexNanshan	?	-
	8A2180g	ApexNanshan	01.42.01	-
5.1	9B3176n	HoodooYabuli	04.12.01	-
6.0	10A316	Sundance	04.12.02	-

iPhone 4 (CDMA)[edit source]

Version	Build	Codename	Baseband	Comments
4.2	8E5074b	Phoenix?	?	Found on an FCC test report [2]
6.0	10A63971b	SundanceTaosTianshan	?	-

iPhone 4S[edit source]

Version	Build	Codename	Baseband	Comments
5.0	9A2264r	TellurideNanshan	?	-
5.1	9B3145a	HoodooYabuli	?	-
	9B3176b		?	-
	9B3176n		1.0.10	-
6.0	10A23941a	SundanceNanshan	2.0.0.2	-
6.0	10B63290m	Brighton?	?	-

iPhone 5[edit source]

Version	Build	Codename	Baseband	Comments
6.0	10A23110j	SundanceNanshan	?	From @nyan_satan on Twitter
	10A23110z	SundanceNanshan	?	-
	10A316	Sundance	1.7.00	-
	10A23941s	SundanceNanshan	?	-

iPhone 5c[edit source]

Version	Build	Codename	Baseband	Comments
7.0	11A63840h	InnsbruckTianshan	?	From @pazbobrov on Twitter
11A93840f	InnsbruckAni?	?	-
11A93840h	InnsbruckAni?	?	From @1nsane_dev on Twitter
11A93840l	InnsbruckAni	?	-
7.1	11D31620l	SochiYabuli		?
7.1	11D31620u	SochiYabuli		?

iPhone 5s[edit source]

Version	Build	Codename	Baseband	Comments
7.0	11A22051f	InnsbruckNanshan?	?	From @DongleBookPro on Twitter
	11A93840f	InnsbruckAni?	?	Originally posted to MacRumors
	11A24580o	InnsbruckNanshan	1.00.05	-
	11A24581c		?	-
	11A24581k		?	From @1nsane_dev on Twitter
	11A360	Innsbruck	7.02-16	Found on an FCC test report [3]
11.0	15A93720r	TigrisAni?	?	-

iPhone 6[edit source]

Version	Build	Codename	Baseband	Comments
8.0	12A310	Okemo	0.26.01	Found on an FCC test report [4]
	12A93311h	OkemoAni	1.00.01	-
	12A93650j		1.00.05	Found on an Idlefish listing by @TipzRickyCheung on Twitter
	12A93650o		1.00.05	-
	12A93650z		?	From @AppleInternalsh on Twitter
	12A93651a		1.00.05	-
	12A93651b		1.00.05	-
8.3	12F69	Stowe?	?	Seen on iFixit's forum [5]
9.0	13A83261u	MonarchSajo	?	From @CollectorApple on Twitter
9.0	13A83262c	MonarchSajo	?	From @ThermalDOE on Twitter
11.3	15E61570m	Emet?	?	From @mcg29_ on Twitter

iPhone 6 Plus[edit source]

Version	Build	Codename	Baseband	Comments
8.0	12A22121a	OkemoNanshan?	?	-
8.0	12A23410x	OkemoNanshan?	?	from @DongleBookPro on Twitter

iPhone 6s[edit source]

Version	Build	Codename	Baseband	Comments
9.0	13A93051l	MonarchAni	0.37.08	-
	13A93051r	MonarchAni?	?	-
	13A93420d	Monarch?	?	-
	13A93420i		?	From @AppleInternalsh on Twitter
	13A93420m		1.00.05	-
10.0	14A83432m	WhitetailSajo?	?	From @OkemoZurs on Twitter
11.0	15A23061c	TigrisNanshan	?	From @mcg29_ on Twitter

iPhone 6s Plus[edit source]

Version	Build	Codename	Baseband	Comments
9.0	13A22120w	MonarchNanshan?	?	-
	13A22121a	MonarchNanshan?	?	Found on an IdleFish listing
	13A283	Monarch?	0.31.02	Found on an FCC test report [6]

iPhone SE (1st generation)[edit source]

Version	Build	Codename	Baseband	Comments
9.3	13E180	Eagle?	4.70.10	Found on an FCC test report [7]

iPhone 7[edit source]

Version	Build	Codename	Baseband	Comments
10.0	14A22580n	WhitetailNanshan?	0.16.01-3	Found on an FCC test report [8]
	14A92340t	WhitetailAni	?	-
	14A93012r		?	-
	14A93013a		?	-

iPhone 7 Plus[edit source]

Version	Build	Codename	Baseband	Comments
10.0	14A22000v	WhitetailNanshan?	?	Found on an Idlefish listing and documented by @_orangera1n on Twitter
	14A22001a		?
	14A22161a		?	From @Dashelus on Twitter
	14A22181a		?	From @1nsane_dev on Twitter
	14A22881a		?	From @Jin_Store on Twitter

iPhone 8[edit source]

Version	Build	Codename	Baseband	Comments
11.0	15A93261h	TigrisAni	00.34.09	-
	15A93720p		?	From @AppleInternalsh on Twitter.
	15A93720r		?	-

iPhone 8 Plus[edit source]

Version	Build	Codename	Baseband	Comments
11.0	15A23061c	TigrisNanshan	?	From @mcg29_ on Twitter
	15A93260r	TigrisAni	?	From @1nsane_dev on Twitter
	15A93621f	TigrisAni	?	From @1nsane_dev on Twitter

iPhone X[edit source]

Version	Build	Codename	Baseband	Comments
11.0	15A783601x	TigrisAni	?	From @1nsane_dev on Twitter
11.0	15A783601y	TigrisAni	?	-

iPhone XR[edit source]

Version	Build	Codename	Baseband	Comments
12.0	16A295	Peace?	?	Found on an FCC test report [9].
	16A13580t	PeaceJade		Found on an Idlefish listing
	16A13580x			From this eBay listing
	16A13580z			From @1nsane_dev on Twitter
	16A13581a			From @ThermalDOE on Twitter
	16A73281c	Peace?		-

iPhone XS[edit source]

Version	Build	Codename	Baseband	Comments
12.0	16A272	Peace?	?	Found on an FCC test report [10]
16A93020u	PeaceAni	?	-

iPhone XS Max[edit source]

Version	Build	Codename	Baseband	Comments
12.0	16A295	Peace?	?	Found on an FCC test report [11].
	16A22481b	PeaceNanshan?		From @YRH04E on Twitter.
	16A23250u	PeaceNanshan?		From @1nsane_dev on Twitter.

iPhone 11 Pro[edit source]

Verison	Build	Codename	Baseband	Comments
13.0	17A525	Yukon?	?	Found on an FCC test report [12]

iPhone 11 Pro Max[edit source]

Verison	Build	Codename	Baseband	Comments
13.0	17A94460w	YukonAni?	?	Found on an eBay listing and documented by @_orangera1n on Twitter
13.0	17A500a	Yukon?	?	Found on an FCC test report [13]

iPhone SE (2nd generation)[edit source]

Verison	Build	Codename	Baseband	Comments
13.2.2	17E160	YukonE?	?	Found on an FCC test report [14]

iPhone 12 Mini[edit source]

Verison	Build	Codename	Baseband	Comments
14.0	18A33310l	AzulYabuli?	?	Found on an FCC test report [15]
14.1	18A33771c	AzulHWYabuli?	?	From @_orangera1n on Twitter

iPhone 12[edit source]

Verison	Build	Codename	Baseband	Comments
14.0	18A23120m	AzulNanshan?	?	Found on an FCC test report [16]
14.0	18A23120p	AzulNanshan?	?	Found on an Idlefish listing and documented by @_orangera1n on Twitter

iPhone 12 Pro[edit source]

Verison	Build	Codename	Baseband	Comments
14.0	18A23120m	AzulNanshan?	?	Found on an FCC test report [17]
14.1	18A23581a	AzulNanshan?	?	From @1nsane_dev on Twitter

iPhone 12 Pro Max[edit source]

Verison	Build	Codename	Baseband	Comments
14.0	18A23120o	AzulNanshan?	?	From @OkemoZurs on Twitter
14.0	18A23121e	AzulNanshan?	?	Found on an FCC test report [18]

iPhone 13 mini[edit source]

Verison	Build	Codename	Baseband	Comments
15.0	19A272	Sky?	?	Found on an FCC test report [19]

iPhone 13 Pro[edit source]

Verison	Build	Codename	Baseband	Comments
15.0	19A272	Sky?	?	Found on an FCC test report [20]

iPhone 13 Pro Max[edit source]

Verison	Build	Codename	Baseband	Comments
15.0	19A272	Sky?	?	Found on an FCC test report [21]

iPads[edit source]

iPad (1st generation)[edit source]

Version	Build	Codename	Baseband	Comments
3.2	7B3341c	WildcatYabuli	?	Found on a MacRumors post
	7B3341e	WildcatYabuli		-
	7B5286a	Wildcat		Found by SonnyDickson, documented on 9to5mac
5.1	9B3176n	HoodooYaubli		-

iPad (2nd generation)[edit source]

Version	Build	Codename	Baseband	Comments
4.3	8F3178a	Durango	?	-
4.3	8F3191d	Durango	?	-

iPad (3rd generation)[edit source]

Version	Build	Codename	Baseband	Comments
5.1	9B87	Hoodoo?	?	Found on an FCC test report [22]
	9B3110u	HoodooYabuli	?	Found on an Idlefish listing
	9B3176a	HoodooYabuli	?	From @mcg29_ on Twitter
6.0	10A316	Sundance	?	-

iPad (4th generation)[edit source]

Version	Build	Codename	Baseband	Comments
6.0	10A33901a	SundanceYabuli?	?	From @DongleBookPro on Twitter
7.0	11A63840h	InnsbruckTianshan	?	Horizontal mode only.

iPad (5th generation)[edit source]

Version	Build	Codename	Baseband	Comments
10.3	14E61810k	ErieTianshan?	?	From @AppleInternalsh on Twitter
	14E62210l	ErieTianshan?	?	From @AppleInternalsh on Twitter
	14E232	Erie?	?	Found on an FCC test report [23]
10.3.2	14F60900i	FranklinTianshan	?	From @AppleInternalsh on Twitter
10.3.2	14F60900l	FranklinTianshan	?	From @mcg29_ on Twitter

iPad (6th generation)[edit source]

Version	Build	Codename	Baseband	Comments
11.3	15E61120h	EmetTianshan?	?	-
	15E61120i			From @ThermalDOE on Twitter
	15E61340m			From @AppleProto03 on Twitter
	15E61570l			Found on an FCC test report [24]
	15E61570m			From @mcg29_ on Twitter
	15E61570o			-
	15E61570x			-
	15E62180f			From this video by @AppleDemoYT

iPad (7th generation)[edit source]

Version	Build	Codename	Baseband	Comments
13.0	17A522	Yukon?	?	Found on an FCC test report [25]

iPad (8th generation)[edit source]

Version	Build	Codename	Baseband	Comments
14.0	18A325	Azul	?	Found on an FCC test report [26]

iPad (9th generation)[edit source]

Version	Build	Codename	Baseband	Comments
15.0	19A311	Sky?	?	Found on an FCC test report [27]

iPad (10th generation)[edit source]

Version	Build	Codename	Baseband	Comments
16.0	20A32640u	SydneyYabuli?	?	Found on an FCC test report [28]

iPad minis[edit source]

iPad mini (1st generation)[edit source]

Version	Build	Codename	Baseband	Comments
6.0	10A378	Sundance?	?	Found on an FCC test report [29]
	10A63970m	SundanceTaosTianshan	?	-
	10A63970v		?	-
	10A63971b		?	-

iPad mini (2nd generation)[edit source]

Version	Build	Codename	Baseband	Comments
7.0.3	11B64940j	InnsbruckTaos?	?	-
10.3	14E62210l	ErieTianshan?	?	-
11.0	15A93720r	TigrisAni?	?	-

iPad mini (3rd generation)[edit source]

Version	Build	Codename	Baseband	Comments
8.0	12A314	Okemo?	3.08.08	Found on an FCC test report [30]
8.0	12A63340h	OkemoTianshan?	?	From @FileAnAardvark on Twitter

iPad mini (4th generation)[edit source]

Version	Build	Codename	Baseband	Comments
8.4	12H33	Donner?	?	Found on an FCC test report [31]
8.4	12H60160o	Donner?	?	-
9.0	13A62950o	Monarch?	?	-
9.0.2	13A64520d	MonarchTianshan	4.02.00	From @AppleInternalsh on Twitter.

iPad mini (5th generation)[edit source]

Version	Build	Codename	Baseband	Comments
12.2	16E31120n	PeaceEYabuli?	?	From @laobaiTD on Twitter
12.2	16E31520i	PeaceEYabuli?	?	Found on an FCC test report [32]

iPad Airs[edit source]

iPad Air (1st generation)[edit source]

Version	Build	Codename	Baseband	Comments
7.0.3	11B34210y	InnsbruckTaosYabuli	?	This is for the iPad4,2 model.
7.0.3	11B34640l	InnsbruckTaosYabuli?	?	-
7.1	11D31620c	SochiYabuli?	?	From this eBay listing

iPad Air (2nd generation)[edit source]

Version	Build	Codename	Baseband	Comments
8.1	12B331	OkemoTaos?	?	Found on an FCC test report [33]
8.1	12B33610i	OkemoTaosYabuli?	?	From journaldulapin.com [34].

iPad Air (3rd generation)[edit source]

Version	Build	Codename	Baseband	Comments
12.2	16E31120m	PeaceEYabuli	?	-
12.2	16E31520i	PeaceEYabuli	?	Found on an FCC test report [35]

iPad Air (4th generation)[edit source]

Version	Build	Codename	Baseband	Comments
14.0	18A325	Azul	?	Found on an FCC test report [36]

iPad Air (5th generation)[edit source]

Version	Build	Codename	Baseband	Comments
15.4	19E11500q	SkyEJade?	?	Found on an FCC test report [37]

iPad Pros[edit source]

iPad Pro (unreleased)[edit source]

Version	Build	Codename	Baseband	Comments
9.0	13A165	Monarch	2.15.00 (debug)	For J98/99AP

iPad Pro (9.7-inch) (1st generation)[edit source]

Version	Build	Codename	Baseband	Comments
9.3	13E31820k	EagleYabuli?	?	Found on an FCC test report [38]

iPad Pro (12.9-inch) (1st generation)[edit source]

Version	Build	Codename	Baseband	Comments
9.1	13B72	Boulder?	?	Found on an FCC test report [39]

iPad Pro (12.9-inch) (2nd generation)[edit source]

Version	Build	Codename	Baseband	Comments
10.3	14E232	Erie?	?	Found on an FCC test report [40]
10.3	14E32020u	ErieYabuli?	?	Found on an FCC test report [41]

iPad Pro (10.5-inch)[edit source]

Version	Build	Codename	Baseband	Comments
10.3	14E22020w	ErieNanshan?	?	Found on an FCC test report [42]

iPad Pro 12.9 (3rd generation)[edit source]

Version	Build	Codename	Baseband	Comments
12.1	16B64	PeaceB?	?	Found on a FCC test report [43]

iPad Pro 11 (2nd generation)[edit source]

Version	Build	Codename	Baseband	Comments
123.4	17E228	YukonE?	?	Found on a FCC test report [ https://fccid.io/BCGA2228/Test-Report/DFS-Test-Report-4649340]

iPad Pro 12.9 (5th generation)[edit source]

Version	Build	Codename	Baseband	Comments
14.5	18E20700y	AzulENanshan?	?	Found on a FCC test report [44]

iPods[edit source]

iPod touch (1st generation)[edit source]

Version	Build	Codename	Comments
1.1	3A53	Snowbird	Found on an FCC test report [45]

iPod touch (2nd generation)[edit source]

Version	Build	Codename	Comments
2.1	5F122	SugarBowl	From @1nsane_dev on Twitter

iPod touch (3rd generation)[edit source]

Version	Build	Codename	Comments
3.1	7C1023e	Inferno?	-
	7C1095a	Inferno?	-
	7C144	Northstar?	-

iPod touch (4th generation)[edit source]

Version	Build	Codename	Comments
4.1	8B1016c	Baker	Found on an ebay listing by Hap Plain
	8B1069b		From this DongleBookPro video
	8B1084b		From @mcg29_ on Twitter
5.1	9B3145a	HoodooYabuli	-
	9B3176b		-
	9B3176n		-

iPod touch (5th generation)[edit source]

Version	Build	Codename	Comments
6.0	10A219	Sundance	From @nyan_satan on Twitter.
6.0	10A351	Sundance?	Found on an FCC test report [46]

iPod touch (6th generation)[edit source]

Version	Build	Codename	Comments
8.3	12H1150f	CopperJade	From @OkemoZurs on Twitter.
8.4	12H10570d	CopperJade	From @1nsane_dev on Twitter.
9.0	13A83262h	MonarchSajo	From this archived tweet
9.3	13C75	Castlerock

iBridge[edit source]

iBridge2,3[edit source]

Version	Build	Codename	Comments
2.4.1	15P765831x	LoboGoatHWBridge?	From @ _cc999 on Twitter

iBridge2,8[edit source]

Version	Build	Codename	Comments
3.2	16P25070u	BridgeOSLibertyC?	Leaked by @Unknown_tags on Twitter

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