Downgrade iPhone 4 baseband

It is sad that iPhone 4 baseband 4.11.08 / 4.12.01 owners have not found a reliable solution for a permanent factory unlock. The desired baseband to downgrade to is 01.59.00.

Since SAM unlock, Gevey, R-SIM, and Rebel Micro Pro can not unlock the baseband, it is similar to iPod Touch in functionality. We are still waiting for a genuine solution that will last forever.

Whoever says he has software unlock for 4.11.08 is not telling you the truth! We have news for those who have totally lost hope and thinking of getting another iPhone which is factory unlocked. There is a hardware hack which can downgrade 4.11.08 to 01.59.00 baseband and hence, you can use the latest version of ultrasn0w after the downgrade.

Infineon chip to downgrade 4.11.08 to 01.59.00 baseband
Infineon X 618 Baseband Chip

The method is provided by beijingiphonerepair and requires you to open up the iPhone, take out your logic board and sent it to them. The method is dependent upon chip replacement service.

The downgrading of iPhone 4 baseband 4.11.08 / 4.12.01 requires these components:

  1. Intel 36MY1EF 128MB NOR chip which costs US$67.00.
  2. Infineon Baseband Chip X618 (pre-programmed) baseband 1.59.00 which costs US$88.00.
  3. Worldwide standard shipping (can be tracked online and will take up to 20 days) which is free.
  4. China domestic first class express shipping which is free
  5. Labor charge which costs $24.00.
  6. 30-days warranty.

This is going to work but the main issue the workers at beijingiphonerepair face is sourcing those rare 1.59.00 baseband chips.

Downgrade iPhone 4 Baseband Warnings

  1. Only custom-made firmware should be used for upgrading while iTunes should be strictly avoided
  2. The IMEI serial number change will be caused by the change of the chip so the unlocked iPhone can be activated using any hacktivated custom firmware and latest ultrasn0w.
  3. There will be no issue in the process of restoration to stock firmware.

We know the method is hectic. But this hardware hack to downgrade iPhone 4 baseband 4.12.01 / 4.11.08 to 01.59.00 is reliable and can allow you to unlock iPhone using ultrasn0w.

Please feel free to share your thoughts!

Unlock iPhone 4 Baseband 4.12.01 Now!

Unlock iPhone 4 4.12.01

  • mk88

    you must be on crank. dumb ass solutions.

  • Goandroidgo

    Abandoned iPhones totally. Bought a samsung note, an s3, and a s4g instead.

  • Nomoreapplestuff

    Go Samsung go! Note. S3. iPhone? A joke.

  • nirav

    I accidentally update my baseband to 04.12.02 and its now cannot be
    used. Its already activated but I cant use any SIM card and its still
    shows “no service”. Does it mean I need to unlock it again? Please send
    me the details. TQ.

    IOS 5.1.1 (jailbroken)

    IMEI: 01 242100 132558 2

  • mandeep

    Someone here mentioned ios is a better experience than android?? dude ios isnt even half as good as android, plug and play file exchange, and application switching is a breeze. IPHONE is surely good phone but i had enough of their locking unlocking BS, and restrictions to use mp3 through itunes, basically android is do anything with the phone, and ios is just keep looking and dont try to customize thing.

  • Jhon

    In other words iPhone means iF**K Moving to Android 4.0 is great

  • abdul qadir

    please help me by giving the answer of my question?
    did iphone 4 baseband 0.12.01 cannot be downgrade without that hardware?

  • n

    i agree, such a crazy man..

  • BluntSmoke

    F&@k that, I like tinkering with stuff but I wouldn’t dream of trying this!!!

  • javed

    this is not a solution and i dont know what it is 🙁

  • Richter Bejay Maala

    how can i locked my iphone 4 4.12.05 firmware? thanks a lot..