How to install Viber on an iPhone 3G 4.2.1 firmware

NOTE: You will need to do a backup of your iPhone so you don’t lose any data. Also must jailbreak your iDevice first. If you are unsure please search jailbreak at the top of the 123myIT website, there are loads of vides to show you how to jailbreak your iDevice.

This video will show you how to install Viber on iPhone 3G 4.2.1 firmware.

Step 1. Backup your information on your device.
Step 2. Wipe your iOS device by doing a restore. This process will set you iPhone back to factory defaults and give you a clean platform to start the jailbreak.
Step 3. Fully charge your iDevice. Open up the brown Cydia icon. It should look something like this.
Cydia Icon
Step 4. In Cydia go into Manage then Sources. Next go to Edit and then Add enter the Cydia/APT url.
At this stage enter then tap Add Source.
Step 5. Tap iPhoneCake, and scroll down to AppSync OS 4.2 or match whatever firmware you are currently using.
Step 6. Download iTools, the direct link can be found on the Downloads section of the 123myIT website here. Install iTools. I tools is the program that will allow us to install the Viber app onto out iDevice.
Step 7. Download Viber from the downloads section here. Click the lin that says Viber for iPhone.

Step 8. Once downloaded open up iTools and use iTools to transfer the Viber app to your iDevice.

Pretty straight forward. And that’s how easy it is to install Viber on an iPhone 3G 4.2.1 firmware. The benefits to installing Viber this way as opposed to installing Whited00r is that you can keep your existing idevice firmware 4.2.1.

install viber on an iphone 3g 4.2.1

For more information on Viber you can check out their website here.
For more information on iTools software click here.

57 thoughts on “How to install Viber on an iPhone 3G 4.2.1 firmware

  1. AMAZING!!! Thank you lots for all your enormous work!
    You really save a lot of people from all the madness of trying to make some applications work on phones which are still working.

    With your help I managed to install both Viber and FB on my Iphone 3G after looking one whole night the internet on solutions for this.

    Real professional work! Thumbs up!

    Quick Q: are you looking also at a solution for whatsapp for Iphone 3G IOS4.2.1?

    Thanks again

    • HI Cristina
      Glad I could help out. Don’t forget to share my site 🙂
      With Whatsapp I have not been able to get it working. I believe the Whatsapp servers are blocked.

  2. hi matt this was awesome now i have viber on my iphone 3g but can find a way to whatsapp on i tried every thing i got whatsapp for the internet the older version and installed it through ifunbox but it says app to old can please help me with

  3. this is an excellent tutorial but i have one problem – when I try to add iphonecake as a source the verification times out repeatedly. is this just my internet connection?

      • thanks, I used a faster internet connection and it worked fine. but encountered another problem – cannot run itools or ifunbox on mac os 10.5.8, apparently not compatible. I got hold of a trial version of diskaid which did the job for viber

        • Hi Aidan
          Glad to hear it worked out for you. Let me know if you find a nice free app that will put the apps on your phone whilst using a mac.

  4. My iphone 3G was corrupted, all my files has gone. Just followed your tutorial, “How to install viber on iphone 3G”. The only remaining word is iphone then the screen turns black. What would i do?

  5. Hello,
    Thank you for your work.
    I’ve been struggling for a few days to install viber on my iphone 3G 4.2.1.
    So, I backed up my phone, jailbroke it and followed the steps of your videos but… :
    – I downloaded viber for iphone from another site (I can only get a .txt file on your site)
    – Ifunbox tells me “error 800007e” when I try to install viber
    – I found an old version of viber online, I installed it successfully through ifunbox, it apperas on my phone but doesn’t open itself…
    Could you help me with that?
    Thank you

    • Hi CT
      Make sure you have App Sync installed. Its important because the files wont start if you don’t have that downloaded to your phone.
      You can use iFunbox or itools to put the app on your phone.
      I started using itools then iFunbox, but ifun box started adding to much advertising so I moved back to itools.
      Here is the link for the viber.
      Make sure you have the .ipa extention on the end of the file. If you don’t then the file may look like a txt file because its will be an unknown file type.
      Let me know how you get on and good luck.

  6. Hi, i have a problem with ur video, in cydia i can’t fine iPhoneCake, where can i indie.

    thank you so much

  7. Im here again, thank you so much for explain how make that, i made a mistake in the process, now is called AppCake, and works great.

    Thanks again, now i have viber in my iPhone 3g


  8. Hey! Nice tutorial but I have a problem when I add the source
    It says “sub -process:/bin/bzip returned an error code” and “some index files failed to download,they have been ignored, or old ones used instead.”
    Please help I think this might be the reason why I can’t find AppSync for my version 4.2.1

  9. Hi Matt,

    Thanks a lot for all your hard work.

    I am having difficulties at the AppCake stage unfortunately. The options I have are:

    – AppCake
    – AppCake for iOS6

    And both do not allow me to install as I need the AppCake for 4.2.1 just like you mentioned in your video.

    I also tried the AppSync Unified that didn’t let me either.

    Please help if you find the time,


    • HI Thanos
      Thanks for your feedback. Since the new iOS 8 release it seems that the app sync 4.2.1 has been removed. Can you try the App Sync 5?
      And let me know if that works ?

      • Thanks for your reply Matt.

        I tried both the AppCakes I have available and the Appsync Unified. Neither worked unfortunately. Any other ideas would be gratefully received.

        Thanks again,


        • Hi Thanos
          In this case you might be out of luck. I havent heard from anyone if there is a workaround for this.
          If you find anyway to fix please let me know.
          Maybe google appsync 4.2.1 no longer working?

        • i am having same problem there are 3 options available but none of them can be installed. What to do plz help..

  10. Hi Matt,

    today I ve installed Viber on my iPhone 3G following instruction in your tutorial, but I cant get authentication code in SMS. I have working internet access on my iPhone and I entered valid phone number, but SMS simply dont come.

  11. Dear Admin,

    Thank you very much for your guiding step by step.

    I have a problem still.

    At the end, when I try to install ipa file from itools. it tells me that because of unauthorized the work will fail. after doing only 15% of job.

    Please help me,

    Sincerely Yours,

    Siyamak Iraninezhad

  12. Hi mate. I have problem with my viber. I have Iphone3G 3.1.3, 6.15.00, Carrier 5.1, whited00r7.1. When i put it viber2.2.0 everything is work. But when i leaved viber i can’t receive messages. I have a code for push notification and fixed. Still can’t receive messages. Can you help me pls. Thank you a lot.

    • HI martin
      Yes, I am not to sure about this. I haven’t used it in along time. I get the feeling some support for this was finished when Apple released ios 8.
      Good luck

  13. i dun know whats happening. after installation it says
    Install fail: Verification failed as the authority is invalid.

  14. I jailbroke my iphone 3g v4.2.1,and I installed Viber.When I try to enter it(by typing my number for getting an SMS authentication code),it says YOU NEED TO UPGRADE YOUR VIBER VERSION…so,I cannot enter it nor use it,at all.Anyone got the solution?

Leave a Reply

Your email address will not be published. Required fields are marked *