iPhone 4 Baseband Chip Downgrade from 4.11.08 to 4.10.01 Service Now Available

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Baseband downgrade from 4.11.08 to 4.10.01 via chip replacement is now possible on iPhone 4.

UPDATE: If yours is locked to AT&T, get the official permanent unlock here. Check our Store for officially unlock iPhone on other network.

My team and I would like to present sort of a good news for those who are currently stuck on baseband 4.11.08 as we managed to downgrade an iPhone 4’s baseband from 4.11.08 to 4.10.01 earlier today on 22 October, 2011.

Editor's note: learn more by reading our ebook on starting your own iPhone repair & unlock business

However, It’s still not now possible to downgrade to 1.59.00 to make it unlockable with ultrasn0w. We have tried this numerous times even before Gevey Turbo SIM was released.

It’s similar to our baseband chip replacement service for 3G and 3GS, but this method requires two different chips to be replaced – the Infineon X-GOLD 618 processor chip and the Intel/Numonyx 128MB NOR DDR chip.

Once your iPhone 4 baseband has been downgraded to 4.10.01, you can then unlock it with a Turbo SIM.

There are a few tiny setbacks with this method – your iPhone serial number and IMEI will change. That means you can only hacktivate (activate) it with redsn0w or use custom hacktivated firmware in order to do a full restore. However, it is still possible to use original firmware to restore your iPhone 4 if you ever need to; unlike iPhone 3G/3GS on baseband 6.15.00 which doesn’t allow you to restore at all.

We are currently doing extensive testing and planning to launch this service very soon have launched this service. Customers who get their baseband downgraded using this service with us will also be getting a FREE Gevey Blue Turbo SIM worth $44.95. If you have the tools and skills to replace them youself, purchase the chips here.

Click here to read more about this service on our online store

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Comments & Discussion

  1. after i changed both baseband chip and nor flash.. now my iphone 4 can activated without needed att sim any more.. but still No Service and Searching.. :(

  2. Guys! Need help for this problem. I accendentally updated my iphone 4 to OS5 which has a Baseband 4.11.08 which also not supported with Turbo SIM or Gevey SIM. Now this iphone 4 of mine was from US and AT&T Lock… i can’t use my iphone now coz of the Baseband updated to 4.11.08.

    Guys! Need your help with this matter if there are any ways to downgrade the baseband.

    Your full support is really apprecaited. Looking forward to hear your feedback back guys.


  3. Hai, I have iphone 4 ios 5.0.1 and modem firmware 04.11.8 it is an AT&T provider in USA. I want to unlock the sim.

    I saw your earlier posts suggested to downgrade the firmware and unlock the sim. Is that still working that way?

    Do you have any alternate solution? I'm from chennai (INDIA)

  4. Thanks for your kind reply.

    You mean changing the chip is the only method? or Downgrade the OS to 4.3.5.?

    Your updates told that apple stopped signing in 4.3.5.

  5. Hi. I want to avail your service. May i know if its still available. Because i saw from your store site, its out of stock. When will it be availble? Thank you very much.

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