should i update my iphone 3g to 4.2.1?

Discussion in 'Jailbreaks and iOS Hacks' started by poohbear19, Dec 18, 2010.

  1. poohbear19 macrumors regular

    poohbear19

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  2. hackthatphone macrumors 68000

    hackthatphone

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    #2
    Sure why not? Oh by the way, SAM is NOT an unlock.
     
  3. poohbear19 thread starter macrumors regular

    poohbear19

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    #3
    i know. will it be slower though?
     
  4. hackthatphone macrumors 68000

    hackthatphone

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    #4
    I think the 3g is a dog on any version of 4.x firmware. I think you are better off on 3.1.3 unless there is something you can't live without in 4.x.
     
  5. poohbear19, Dec 20, 2010
    Last edited: Dec 20, 2010

    poohbear19 thread starter macrumors regular

    poohbear19

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    #5
    oh ok thanks. i just wanted to try it out. so if i update it to like a 4.0.1 could i use an shsh in ishshit in cydia to go back to 3.1.3?
     
  6. mikelegacy macrumors 65816

    mikelegacy

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    #6
    Possibly. Do you have a 4.0.1 SHSH? If not, you'll have to update the whole way up to 4.2.1.
     
  7. poohbear19, Dec 20, 2010
    Last edited: Dec 20, 2010

    poohbear19 thread starter macrumors regular

    poohbear19

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    #7
    Yeah i have all the shsh's 4.0 and above in cydia's iSHSHhit but couldn't i just update to 4.0.1 using a 4.0.1 ipsw file using shift restore or shift update?
     
  8. PsstGreek macrumors 68040

    PsstGreek

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    #8
    First you would have to edit your host files to restore.

    C:windows/system32/drivers/etc/hosts <--Windows

    Finder > Go to folder > /etc > host <--Mac

    You host file should look like one attached:
     

    Attached Files:

  9. poohbear19 thread starter macrumors regular

    poohbear19

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    #9
    sorry i'm not sure what host files are. are they the shsh's that cydia told me to send to my email?
     
  10. PsstGreek macrumors 68040

    PsstGreek

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    #10
    The host file is what iTunes communicates with to restore your iPhone. Apple's server or Cydia's server.

    To restore your iPhone using the SHSH you need to edit your host file to the Cydia server.
     
  11. poohbear19 thread starter macrumors regular

    poohbear19

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    #11
    oh ok. i went all the way to hosts what program should i use to open it?
     
  12. PsstGreek macrumors 68040

    PsstGreek

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    #12
  13. poohbear19 thread starter macrumors regular

    poohbear19

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    #13
    I have a 3g, but that's fine. So if I update to 4.0 or above I can never go back to 3.1.3 ever again?
     
  14. Myzhi macrumors 6502a

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    #14
    With 3.1.3 or below, you can always restore to them because Apple didn't add the SHSH req for 3G iPhones until afterward. And, I thought 4.0-4.0.2 was very slow on 3G, people complain, and supposedly, Apple improve with 4.1-4.2.1. That's not correct? Why not go to 4.2.1 using a custom firmware file (one that keeps the current baseband and possible unlock)?
     
  15. Applejuiced macrumors Westmere

    Applejuiced

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    #15
    I agree.
     
  16. poohbear19 thread starter macrumors regular

    poohbear19

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    #16
    Hi Myzhi, so If i update to 4.2.1 then I could always go back to 3.1.3 with the ipsw file no problem? Is there a difference between an ipsw file and custom firmware file?

    and If i wanted to update and since my phone is unlocked would i need to restore to the 3.1.3 ipsw file first and then doing the regular 4.2.1 update through iTunes? Or would that change my baseband?
     
  17. Myzhi macrumors 6502a

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    #17
    The regular official ipsw will always change the firmware and baseband (only upgrade, but never downgrade). Thus, if you need to unlock, you want to use a custom firmware file so you can keep your your current baseband = possible unlock. Custom firmware also allows you to hackivate the phone so you don't have to activate the phone.

    If You need to unlock, you should never update with the official ipsw unless there's a current unlock available for that firmware. Currently, the unlock for 4.2.1 is not very desirable so you should use a custom 4.2.1 firmware file instead. And, yes, you can always restore to 3.1.3 or below firmware on 3G iPhone. Note, even if firmware can be downgraded, the baseband won't.
     
  18. poohbear19 thread starter macrumors regular

    poohbear19

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    #18
    WOW you are very informative Myzhi. Everything makes sense now:D. thank you so much. you helped lots. Why do you say that the unlock for the regular 4.2.1 isn't desirable?
     
  19. Myzhi macrumors 6502a

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    #19
    You need to use hack 6.15 iPad baseband to unlock. If you use it, you can't restore with the official firmware file. Phone ends up in recovery mode. Secondly, it could also cause GPS problems. And, that's why it's not a very desirable route to unlock.
     
  20. poohbear19 thread starter macrumors regular

    poohbear19

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    #20
    o soo that's what you meant that 06.15.00 is the only other way that 4.2.1 can be unlocked on. ohhh ok thank you!
     
  21. poohbear19 thread starter macrumors regular

    poohbear19

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    #21
    it actually worked out fine on my 3g
     

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