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

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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).

UPDATE: Any AT&T iPhone can now be factory unlocked, read here to learn more. Other worldwide networks may be unlocked as well.

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.

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


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.

Alternatively, we also provide this as a service. Please see details here.

German iPhone jailbreaking website re-posted this article.

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Comments & Discussion

  1. Hi, can you help me with an question?
    So, i try to update BB ipad on a 3GS new rom, but not finish the process on ultrasn0w. The phone never power on again always stays on DFU mode. trying also a custom firms but no luck… goes to the end on itunes with out errors but stay on dfu.
    I point the problem to the BB IC. my question is.
    Can i change BB ic from other damage board that's i have to parts?
    If i buy new one it is programed?
    Thanks Kit0

  2. hi,

    according to this diagram: http://www.clangsm.com/forum/uploads/monthly_10_2… you replaced the sram chip, not the baseband, am I wrong ? in this guide you used a 3G board, right?

    I have a 3Gs 32 gb board, that says, unknown imei and iccid, no wifi, no bluetooth and nothing in baseband version/Modem Firmware, do you think that replacing the chip would solve the problem ?


  3. Can you fix my iphone 3gs with new bootrom? I have installed the 6.15.00 baseband and i want to go back to the 5.16.05 what was original on the phone. I requested a factory unlock for my IMEI . Is this possible?

  4. Pingback: iphone 3gs 05.13.04 baseband dump?

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