Download iOS 4.2.1 Firmware for iPhone, iPad, iPod Touch - iPhoneHeat

Download iOS 4.2.1 Firmware for iPhone, iPad, iPod Touch

iOS 4.2.1 firmware is now available for download. You can download iOS 4.2.1 firmware for iPhone 4, 3GS, 3G, iPad, iPod Touch 4G, 3G, 2G. iOS 4.2 build 8C148 download links can be found below…

Download iOS 4.2.1iOS 4.2.1 comes as a universal firmware for iPhone 4, 3GS, 3G, iPad, iPod Touch 4G, 3G, 2G. To install iOS 4.2.1 on your device, connect your iPhone/iPod Touch/iPad to iTunes 10.1, new firmware availability message will appear then hit the “Download and Install” button. You can also download iOS 4.2.1 firmware from the links below.

WARNING: Jailbreakers/Unlockers MUST stay away from iOS 4.2.1 until further notice.

Download iOS 4.2.1 Firmware

You can download iOS 42.1 firmware (IPSW files) for iPhone 4, iPhone 3GS, iPhone 3G and iPod Touch 4G, 3G, 2G from the links below.

Download iOS 4.2.1 for iPad

Download iOS 4.2.1 for iPhone 4

Download iOS 4.2.1 for iPhone 3GS

Download iOS 4.2.1 for iPhone 3G

Download iOS 4.2.1 for iPod Touch 4G

Download iOS 4.2.1 for iPod Touch 3G

Download iOS 4.2.1 for iPod Touch 2G

You can download the latest iTunes 10.1 from the link below:

We’ll keep you updated as soon as iOS 4.2.1 jailbreak tools are available for download along with detailed step by step instructions.

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160 comments… add one
AfRoO November 23, 2010, 1:05 am

yep yep yep I’m downloading it 😀 \m/ thanx guyz

coolkid123 March 19, 2011, 6:22 pm

i a, an apple geek i have an apple ipod touch 3rd generation and an ipod touch 4th generation

timmyt May 25, 2011, 5:18 am

how do u jail break the 3rd generation i-touch i need step by step directions

jimjy June 2, 2011, 11:29 pm

go and download it then they will give u steps from there

NeffKidd August 2, 2011, 1:38 pm

ayy need help when down load the softwear where do i fnd it at ?

crazy hacker April 13, 2012, 2:15 pm

an easy way to jailbreak most devices is to use snowbreeze. It gives u a step by step guide on how to jailbreak.

EDSON May 17, 2012, 3:08 am

then show mi how to do that, i am new in thise
and want to learn you want to help me …..

Carl devis November 23, 2010, 1:55 am

badly waiting for jailbreak too hope it can easily jailbreak too without having tough step by step procedures…
will it work fine on iphone 3g 16 gb? if anybody knows do tell me too

naxcid February 18, 2011, 10:03 pm

Watup man, yes it will work

coolkid123 March 19, 2011, 6:25 pm

if it doesn’t i use a program that kills itunes so you can downgrade your ipod if u have any questions comment plz

Carl devis November 23, 2010, 2:04 am

downloading it too 😛 but will install it after getting jailbreak 🙂 my phone is locked due to updation on 5.14.02
dats why need to update on 4.2 rite now running 4.1

Jack November 23, 2010, 8:00 am

Now is the unlock for baseband 5.14.02 going to be released…………. And when is it going to release?

a January 21, 2011, 5:04 am


rajhere November 23, 2010, 9:14 am

Hey guys its very good news….

I think unlock will release in 48 hours.

sowat99 November 23, 2010, 11:15 am

I hope they would release the 5.14.02 baseband unlock, now that 4.2.1 is released. fingers crossed

rajhere November 23, 2010, 12:59 pm

Yeahhhh waiting for a long time, hope soooonnn.

AfRoO November 23, 2010, 1:13 pm

hey guy’z the 4.2 jailbreak is avaliable but no unlocking way still, also for who’s depend on unlocking to use their iPhones u have to stay away from this iOS4.2 cus it Upgrading the BaseBande,
www dot blog.iphone-dev dot org
thanx for Dev-Team & Thanx for iPhone-Heat

carldevis November 24, 2010, 7:33 am

still waiting for 5.14.02 unlock :S
i think 48 hours done…..they should release it now :p

AfRoO November 25, 2010, 1:32 am

I think if there’s unlocker available it will be tomorrow in thanksgivin

Chandler2 November 30, 2010, 1:35 am

Every time i try to download the firmware for my iphone (3g version 4.2.1) it downloads as a compressed file and when i get ready to jailbreak it and open redsn0w i cannot locate it bc its not saved onto my desktop. but when i download it as a compressed file, i do save it to my desktop…IM LOST PLEASE HELP

iPhoneHeat December 1, 2010, 2:29 am

make sure the file extension is .IPSW

Noel December 9, 2010, 8:59 am

i download the zop file. extract it, there are no ipsw files. You say rename the extention, but what files to change


Matt December 12, 2010, 4:27 pm

You change the ZIP file to a .IPSW file.

tray55555 December 22, 2010, 9:20 am


daniel309 March 8, 2011, 11:56 pm

nswr the question please¡¡¡

rajhere March 9, 2011, 9:09 am

Just Rename the .zip to .ipsw for example then rename it like 2_4.2.1_8C148_Restore.ipsw thats all

coolkid123 March 19, 2011, 6:27 pm

yea if it is a zip file it is compressed and you need a program to unzip that

will1313 May 15, 2011, 9:11 pm

i have done all the steps ive even redownloaded the firmware twice and after i change it to ipsw it says unable to recognize specified ipsw what do i do im stuck

lmin September 9, 2011, 10:46 am

I tried changing from zip to ipsw for hours its a waste of time. then i downloaded firefox web browser and it does not zip files it downloads them as they are. in this case ipsw. it worked perfect.

AL TAMIMI December 16, 2010, 3:21 am


canefan56 January 2, 2011, 4:22 am

changed file extension to .ipsw but when it unzipps it says some files could not be encrypted. then it doesnt give the little white ipod icon next to file. it still shows the yellow file

jloera January 2, 2011, 11:50 pm

did you get it to work???

bradtheguy23 January 25, 2011, 2:27 am hope this answers all your questions it did mine

SKY January 24, 2011, 3:46 am

anybody know how 2 jailbreak iphone 3Gs 16 V4.2.1….
please… tell…..

Shinjo January 28, 2011, 5:32 pm

I want to jailbreak my iphone4 4.2.1 and downloaded the firmware for iphone4 4.2.1 but it doesn`t work. I am new to all things things so plz guys could some help me to download the firmware…

amy February 16, 2011, 3:12 am

i need a answer fast my iphone is stuck in recovery mode and it is jailbroken and i cant find the right ipsw file or so redsnow tells me.. help plz i need my iphone

krts March 13, 2011, 4:34 pm

i have ipod touch 4g ios 4.2.1
i want 2 jailbreak it i tried greenpoison n limerain but they’re not working. i hav windows 7 . is it compulsory to download the .ipsw file? plz help

lockmote March 16, 2011, 12:29 pm

can I upgrade my iPod Touch 3G iOS 3.1.2 64gb MC model to iOS 4.2.1 ?

Augusto March 17, 2011, 7:22 pm

meu, ta demorando muito isso

lie vivian March 30, 2011, 7:47 pm

Pls let me know when I can unlock my Iphone 4 firm ware 4.2.1

beau April 4, 2011, 4:21 pm


peewee2563 April 15, 2011, 1:56 am

im downgrading my phone 4. how do i put the new frimware on it?

rajhere April 15, 2011, 10:34 am

Open iTunes and connect the iPhone to your PC/Mac

Press and hold the Home button and the Sleep/Wake button at the same time.

After exactly 10 seconds release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.


diakhadiop April 18, 2011, 10:39 am

j’ai pas decommenter

Jin May 4, 2011, 8:57 pm

thank you very much !: )

jamg16 May 26, 2011, 9:10 am

ok so when im done downloading the downgrde for my iphone what do i do next after is done???? hellppp please

anthony1860 October 21, 2011, 5:06 am

once you downgrade your iphone download greenpois0n

JbJr6 June 4, 2011, 12:44 am

I’m having trouble with green poison reading that my iphone 3g is in dfu mode

allen June 7, 2011, 11:33 am

can an iphone 4 that came with iOS 4.3.3 be downgraded? We’ve tried all the posted options, but it seems not working. We never upgraded to 4.3.3, already installed, so no old firmware to save. Possible to still download and use a general 4.2.1 firmware?

yetix July 10, 2011, 12:42 am

can i use this software for restore in itunes?

jwk12321 July 21, 2011, 11:53 am

I dont get the zip file stuff, what exactly do i have 2 change in .IPSW??
because redsn0w can’t find these files…
I want to get the puzzle/lego block thing… from above

jwk12321 July 21, 2011, 11:58 am

nothing is called zip or .ispw

oshios August 16, 2011, 4:33 am

Hey guys, thanks for your informative posts. Pls I do have a question. My iphone runs on version 3.0.1. (7A400), with modem firmware 04.05.04_G. Is my iphone 3g, 3gs or 4g ? Pls help me out so that i can update to 4.2.1. Thanks yah all.

Ayman September 1, 2011, 10:21 pm

hey guys i had a problem when i had jailbreak and unlock my iphone by redsnow and firmware 4.2.1 than how i should update with a new version 4.3.3 please reply anyone from u?

Anthony11111 September 27, 2011, 1:52 am

Guys please need help:i have ipod touch 3rd generation with software 3.1.3(original one that came with ipod),jailbroken, and i want to update to any other frimware. I tried many things like update from itunes, or clicking shift + update or restore and clicking the software…. even with DFU mode…but it always say “unknown error occured (3914)..” Please it has been 1 month trying to find solutions to fix it but nothing new :(((( Please help me!

blade6533 October 8, 2011, 6:30 am

Please help me how to fix my iphone 3G b/c it keep on say no service or searching. I get signal sometime but some it goes to no service/searching for hours or days. This iphone was jailbroken but it was restore back top factory with a 4.2.1(8C148).

Anfaz October 12, 2011, 9:17 am

where to download iOS 4 for iphone 2g 3.1.3 mod

parto October 15, 2011, 3:31 am

plz tell me how to jailbreak this .i’ve downloaded ios 4.1 for my 2G ipod touch!! 😀 mail me if you can help
[email protected]

blade6533 October 22, 2011, 10:04 pm

How to downgrade from 4.3.5?

osaham October 26, 2011, 1:52 am

why we need to download frimware ? why we need it ?

Rith November 18, 2011, 6:11 pm

I have ipad2 to jailbreak it? That have version 4.3.5…..

rachthan November 25, 2011, 1:26 am

je vais éssayer on véra bien

ansh November 27, 2011, 1:01 am

man its just paradis

rickytan January 6, 2012, 7:12 pm

the downloaded ipsw isnt working for redsnow, does the jailbreak still work for 2nd generation with 4.2?

pavan\ January 30, 2012, 11:36 pm

i had ip 3g version 4.2.1
any upgrade version for it
pls help me

tean February 1, 2012, 1:26 pm

my iphone 3g after i jailbreak 4.2.1 vision, no signal how i need to do T_T

yasir February 25, 2012, 3:54 pm

You need to download carrier from cydia for your iphone.

cwhiggs April 25, 2012, 2:16 am

its almost done i cant wait to downgrade my iod from 5.1 to 4.2.1

Gonzague May 20, 2012, 11:00 pm

plizz can you speak frensh my y not a comprende your langue

siva24 June 11, 2012, 7:41 am

hi, pls help to download this software

monkey1 July 1, 2012, 2:19 am

i have a iphone 3gs n it wont let me upgrade it past 3.1.3 any help???? it is not jailbroken yet

mj August 22, 2012, 9:05 am

hola por que cuando descargo no me aparese el cuadrito en blanco me aparese en winrar y lo descomprimo y no sale puras carpetas y no las puedo utilisae

alsadiq September 12, 2012, 2:37 pm

please can someone tell me how and were to download 4.2.1 official firm ware

primo December 27, 2012, 7:34 am

thanks guy i hope can i finish this , sonwload successful

Fuck apple January 10, 2013, 3:55 pm

Grown to hate apple and its fucking ios updates and all that shit cant even use whatsapp anymore because of this fucking shit binning this piece of crap iphone 4 going back to htc way better so fuck off and die apple!

androidlover February 6, 2013, 8:42 pm

“Fuck apple”.. Man you speak for us all, 4 pods and 2 phones later, you have my vote! They are the biggest rip off merchants going, I put them up there with insurance companies and HP, Dell and Acer customer customer service.

andy February 24, 2013, 11:56 am

plzz any one help me…while restoring ios 4.2.1 i get error 1604 and my tiny umbrella is not working also…i got iphone 3g

andy March 3, 2013, 9:51 am

my tinyumbrella isnt working coz i messed with it…any alternative of it..which can suport iphone 3g

Ronny CH Marak March 20, 2013, 11:25 am


lotala djo ismael April 18, 2013, 9:59 am


KoKhinmgthein May 18, 2013, 7:46 pm


hingin June 25, 2013, 1:34 am

Does it work??? plz reply 🙂

ayoub nay July 11, 2013, 5:07 pm

is very good is coul!!!!!!!!!!!!!!!!!

Aster July 20, 2013, 9:17 am


kankam junior September 27, 2013, 9:08 am

can i upgrade iPod touch 2nd generation thus 4.2.1(8C148)

EPIC January 12, 2014, 8:33 am


carlos olivery April 6, 2017, 6:44 am

yes no icloud

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