Knowing

I am not selling this, But providing information to the interested persons of these options they can do themselves or pay for someone to do.

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 on 22 October, 2011.

However, it’s still now possible to downgrade to 1.59.00 to make it unlockable with ultrasn0w.
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 128MB NOR flash 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.

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If you are stuck on baseband 4.11.08 which presently cannot be unlocked with ultrasn0w or a Turbo SIM, this is the service for you. It is similar to our popular iPhone 3GS baseband chip replacement service.
Once your iPhone 4s baseband is downgraded to 4.10.01, you can unlock it with a FREE Gevey Turbo SIM which is included in this service.
There are two chips that need to be replaced in order to downgrade your iPhones baseband.
Service price breakdown:

• Pre-programmed Infineon Baseband Chip X618 with baseband version 4.10.01: US$68.00
• Intel 36My1EF 128MB NOR chip: US$37.00
• Labor charge: US$23.00
• Gevey Blue Turbo SIM worth US$44.95 (112-free, no SIM card cutting required): FREE
• Worldwide standard shipping (up to 21 business days, trackable online): FREE
• China domestic first class express shipping: FREE
• 30-days warranty

Optional Express Shipping is available at US$25.00 (up to 7 business days) to these following destinations:

• USA
• Canada
• Australia
• New Zealand
• Japan
• Western Europe including Republic of Ireland and United Kingdom
• Japan
• Malaysia
• Singapore

Notes:

• Your iPhones serial number and IMEI will change - this means you can only activate your iPhone using redsn0w or hacktivated custom firmware
• You can restore to stock firmware without any issue but the point above (activating using redsn0w) still applies
• All other functionalities will not be affected
• We are offering the only workable solution in the planet but only purchase this service if you have considered all options and understood everything

I am not selling this, But providing information to the interested persons of these options they can do themselves or pay for someone to do.


If you are stuck on baseband 5.14.02, 5.15.04 or 5.16.02 which presently cannot be unlocked by ultrasn0w, you can fix it by replacing the baseband chip. Fix your GPS issue if you have baseband 6.15.00 and increase the resale value of your phone with a baseband that can be unlocked with ultrasn0w.

This is a genuine Infineon X-Gold 608 baseband chip which is designed for iPhone 3G, 3GS and iPad 1 (FYI – that’s why iPad’s baseband 6.15.00 can be implanted into the iPhone).

To learn more about this microchip, the full technical specifications can be downloaded from here.

The baseband chip is pre-programmed with baseband version 5.13.04 which can be unlocked using ultrasn0w.

What’s the Cost?

• Baseband chip: pre-programmed with baseband 5.13.04 or lower that can be unlocked with ultrasn0w $ 57.95 (September Promo – extended to October, now to November due to popular demand!)
   
• Labor: USD23.00
• Express Shipping: USD25.00 to Australia, NZ, North America and Western European destinations.
• Standard Shipping: USD8.00 to any destination (trackable online via http://www.track-trace.com/post).

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Exclusive: How to Replace iPhone 3G/3GS Baseband Chip Step-by-Step Guide with Photos

If you are familiar with DIY electronics repairs and do not mind destroying your iPhone, you can refer to the rough guide below on how to replace your baseband chip pre-programmed with baseband 5.13.04 (or lower) which can be unlocked using ultrasn0w 1.2. This method will fix your iPhone’s GPS issue (baseband 6.15.00).

What you need:

• Hot air gun
• Solder paste
• Soldering iron
• Tweezers
• Isopropyl alcohol
• Pre-programmed replacement baseband chip (you can purchase this from us)
• Good lighting, table etc.
• Patience

WARNING: This is not meant for amateurs. We are not responsible for any damage caused to your iPhone. Please always practice safety first.

Steps:
1. Disassemble your iPhone and remove the logic board. See Google video here.
2. Remove the EMI shield and take note of the baseband chip marked ‘X.’

3. Cover the surrounding area of the mainboard and use a hot air gun to melt the solder that holds the chip. Ideally, the temperature should be around 290 degree C. Check out some YouTube videos here.
4. Gently remove the baseband chip from the logic board.



5. Clean up any residue left on the logic board with a soldering gun and rub the area with a piece of cotton dabbed with alcohol.


6. A close-up view of the cleaned area of the logic board.


7. Now you are ready to mount the new baseband chip. See YouTube video here for recommended ways to do it.


8. Once you have mounted the chip, wait for at least half an hour before reassembling your iPhone.
9. Turn on your iPhone and check that you now have an older baseband 5.13.04.



10. Jailbreak your iPhone if you haven’t done so and unlock it with ultrasn0w. You now have an unlocked iPhone and your GPS and other issues should be resolved.  

Note: This method does not make your iPhone factory-unlocked. You still have to be careful not to update it directly via iTunes.