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