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Details for iPhone 3G Custom Restore Firmware 4.2.1 8C148 ipsw
Created by Ratio: 1.67blueeyeblond 6 years ago
Applications : Iphone / Ipod touch : English

iPhone 3G Custom Restore Firmware 4.2.1 8C148.ipsw


*This custom firmware is for iPhone 3G only

*Your iPhone must be previously jailbroken with any method except Spirit method, in order to jailbreak with this custom firmware

*You must have internet connection during this entire process


1. Back up your iPhone with iTunes

2. When your iPhone is in operating mode, hold down Shift key on your keyboard for windows, and alt key on your keyboard for mac, and then click Restore button in iTunes and locate the file "iPhone 3G Custom Firmware 4.2.1 8C148.ipsw" that came with this firmware, and ready to restore.

3. Once restore is done, the iPhone will activate

4. If you open Cydia then it will not open because you will need to update Cydia by doing step 5 and step 6 below:

5. SSH into your iPhone and copy the Cydia folder that came with this firmware into the iPhone directory given below:

/ private / var / root / Media

6. Reboot your iPhone

7. After reboot, now open Cydia has been updated, and you can open Cydia and perform all necessary updates as usual

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Posted by Ratio: 1.00e73 6 years ago [ Complain ] [ Send PM ]

Unfortunately they don't work as described for me and I tested this on two iPhone 3G phones both RedSn0w JB back on 3.0 with 04.26.08 as the baseband. SSH has not been included in this custom restore file as can be determined when running Cydia and installing a few basics.

GOOD NEWS is that there is a simple fix.


OK What I did on my PC running the latest version of iTunes.

1. Backed up every file I wanted to keep. Remembered to transfer photos etc etc.

2. (Same as original instructions) When your iPhone is in operating mode, hold down Shift key on your keyboard for windows, or alt key on your keyboard for mac, and then click Restore button in iTunes and locate the file "iPhone 3G Custom Firmware 4.2.1 8C148.ipsw" that came with this firmware, and ready to restore.

(Please note that RESTORE is what you should do. If you don't want to restore then don't bother upgrading as you have a high chance of something screwing up so why take the risk)

If you didn't get an option to select the file and it starts restoring without browsing for a file do yourself a favour and STOP IT NOW and figure out if you are using a PC or a Mac and then push SHIFT for PC or ALT for MAC. Don't want to sound condescending but really don't care. :)

3. Yeah once you are complete I assume it will activate as long as you are still plugged into iTunes but my phone is unlocked so I have no idea if it will Activate properly if you are not using a proper carrier SIM. I'm assuming the dude ticked the Activated box and also ticked the background and task switching box when they created this one as I see the background with zToggle but I haven't tested the task switcher as I really don't want to use it.

4. I couldn't SSH using Terminal on my Mac or a number of different methods on my PC. So I turned to RedSn0w
has a link to redsnow in the text (not the links on the left)
Or if you reduce the length of that link you will find the root with Muscle Nerds name on it


You will need an OFFICIAL Firmware from Apple. Here is the easy way to get it.
Which will give you this link,2_4.2.1_8C148_Restore.ipsw

Remember that you do NOT ever use this on your iPhone through iTunes. ONLY use this for RedSn0w. Put it in a folder named appropriately warning you to not restore with that file. If you screw up don't say I didn't warn you.

Now run RedSn0w and point it at your official firmware and then when the next screen comes up untick EVERYTHING except for INSTALL CYDIA. Follow the instructions to put it into DFU (Please note that on a PC it might say it failed on the first attempt as your PC installs the new hardware but do not touch your iPhone just touch RedSn0w and go back and push the DFU button again and it will quickly realise that it is already in DFU and let you continue)...

Wait patiently and your phone will look like it is trying to JB again but in fact all it does is install Cydia.

Now here is some more info for the really dodgy people in the world

Added the following Cydia Sources

Install these in order

Ultrasnow (If you need it instructions are in iClarified and iphonedownloadblog so go read)

From the Hackulo Us repo install all of the applications (obviously only 1 AppSync) this will give you Installous which is the best little TBYB application you can get.

iFile (Xsellize)
Action Menu Plus Pack (Xsellize)
AttachmentSaver (Xsellize)
Cyntact (Xsellize)
SBSettings (Get some cool toggles as well)
MobileTerminal (NEW) (Xsellize)
Netatalk (Cause I use a Mac)
YourTube 2 (Xsellize)
Notifier+ (Xsellize)
Safari Download Manager (Xsellize)
SwapCamRoll (Hide your porn)
FullScreen for Safari (Xsellize)
Five Icon Dock

That makes a very nice simple iPhone 3G with lots of great tweaks.

Please note that everything that says (Xsellize) except for MobileTerminal can also be purchased through Cydia from the developers. Please support them.

Now don't forget to change your password (Instruction on the first page of Cydia but you need to use the Xsellize version of MobileTerminal as that is made for iOS 4.x )

And lastly. If you have any questions go ask Google. XD

Before you embark on a journey of revenge, dig two graves.
Posted by Ratio: 1.00kahlil67 6 years ago [ Complain ] [ Send PM ]
is this unlocked? how's the iOS 4 working for your 3g so far? i heard its pretty slow...
Posted by Ratio: 1.00kahlil67 6 years ago [ Complain ] [ Send PM ]
is this unlocked? how are your 3g phones on iOS 4 so far? i heard they can be pretty slow....
Posted by Ratio: 1.00thiorim 5 years ago [ Complain ] [ Send PM ]
I can't find at

It seems the file was removed, If u have a copy please upload it.. I am Stuck since i can't risk using another redSn0w version.
Posted by Ratio: 1.00sammixoxo 5 years ago [ Complain ] [ Send PM ]
good download thanks cant jailbreak without this....took me 3 days to find that out...also took me a few days to work out that most redsnows dont work on the 3g 8 gb just sais not compatable with this version yet...oooh an ultrasnow doesnt unlock versions over 3.1.3...mines 4.2.1 an i gotta downgrade to get it to work but to much effort so my iphones just gonna be a ipod for now :)
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