Downgrading iPhone 4 Logic Board to Baseband 1.59.00 Is No Longer an Impossible Feat!

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Well, we hate to boast but our team has successfully downgraded an iPhone 4 from baseband 4.11.08 to 1.59.00. Another milestone for the team!

UPDATE: AT&T iPhone 4 can now be officially unlocked, click here to learn more.

Karen, a US-expat who is currently based in Harbin, China is one of the many iPhone 4 users who accidentally updated their baseband to 4.11.08. Karen was able to downgrade to iOS 4.3.3 using her saved SHSH, but of course that did not downgrade her baseband. She sent her iPhone via SF-Express over the weekend.

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

The photo above shows her phone which has been successfully downgraded to 1.59.00, jailbroken on iOS 4.3.3 and already unlocked with ultrasn0w.

She was previously using a Gevey Pro Turbo SIM (not a genuine one, though as you can see from the picture) but she can throw that away now. I’m trying to get Karen to write up her experience once she receives it as currently the iPhone is on its way back from Beijing to Harbin. Update November 4, 2011: Her iPhone had arrived safely!

I reminded Karen not to update it directly via iTunes because replacing the chips does not make it a factory-unlocked iPhone. If she needs iOS 5 installed, she must always use custom firmware in order to preserve the baseband.

Karen just sent me an email with the following feedback:

“I’m from Harbin China I upgraded my iPhone to iOS 5.0 then was able to downgrade to 4.3.3 but my Gevey chip stopped working because the (modem) firmware had been upgraded. Sent my phone to Richard. Within the week I got my phone back 1.59 firmware unlocked with ultrasnow no gevey needed anymore. He’s the iPhone god! Very sweet and patient an even helped me with a few things once his job was done. Awesome service! Glad I found him.”

Another feedback from our customer named Robbert, an expat based in Guangzhou, China. He shipped his iPhone 4 to us which was locked to 4.11.08. It’s been downgraded to 1.59.00.

This is very similar to our iPhone 4 baseband chip replacement service, except for this case you must have a “donor” baseband chip.

I’m not here to promote this service but it’s just to show to everyone that there’s nothing “The Fruit” can do to stop hackers and people like us from doing any unlocking. So the next time when someone’s saying “SOL” to you, don’t believe him/her.

Downgrading iPhone 4 Logic Board to Baseband 1.59.00 Is No Longer an Impossible Feat! was last modified: July 13th, 2019 by Joe Wang

Comments & Discussion

  1. Hi I m getting advice from your site quite a while now and I think you have great sence of responsibility for your readers/ followers.

    My questions are:

    A. Is possible to replace 6.15.00 bb in order to fix gps issue on 3GS?

    B. Is possible to downgrade 4.11.08 bb to 1.59.00 via chip replacement?

  2. Hi unfortunately I bought an iphone 4s which has been blocked by a uk service provider, can you change chips to change imei? Any help would be Appriciated, thanks.

  3. Hi,

    I have an Iphone 4 which is running on 5.1.1. However, the baseband has been changed to 4.12.01 due to which my card is not being read. wanted to know if there is any simple way to downgrade the baseband. I have tried ultrasn0w but no use.

  4. I've a iPhone 4 locked to Austria A1. Previously I had iOS 4.2.1 and 04.10.01 baseband and used Gevey to unlock. Now its updated to iOS 6.0.1 and 04.12.02. I've saved SHSH for 4.3.3, 5.0.1 and 5.1.1. Can i downgrade the baseband to previous baseband so that I can still unlock it using Gevey?

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