Restore and Update your iPhone 3Gs to 4.3 on 6.15.00 Baseband

This method will either fix your bricked 3Gs (6.15.00 Baseband) that was accidentally updated to 4.3 or will allow you to update the 6.15.00 Baseband 3Gs to 4.3 while keeping your unlock and jailbreak. This Video Is ONLY for 3Gs Users On 6.15.00 Baseband (see below to get that baseband) If you Have a 3G on 4.2.1 6.15.00 That you need restored/fixed then watch this video: iPhone 3G 6.15.00 Restore

NOTE: The jailbreak Is semi tethered! (Old Bootrom 3Gs is Untethered). Meaning that if your battery dies or you reboot your iPod then Cydia will no longer work until iBooty is run on the pc. You Will Need iReb, Your Custom 4.3 Restore, and iBooty For Booting the New Bootrom 3Gs.

Also if you want to unlock 4.3 & jailbreak and if you have a 3Gs that is on 5.14.02, 5.15.01, or 5.16.01 Baseband you must update it to 6.15.00 Using this video: 4.2.1/4.3 6.15.00 Unlock and ONLY SELECT iPad Baseband In Redsn0w when installing the 6.15.00 Baseband.


New Bootrom: New Bootrom 4.3 3Gs 6.15.00 Restore

Old Bootrom: Old Bootrom 4.3 3Gs 6.15.00 Restore

iBooty For Booting Tethered: iBooty 2.2

iReb Download: iReb r4


To learn which Bootrom you have, find your serial code and look at the 3rd, 4th, & 5th numbers. If they are 945 or below then you have an old Bootrom, If 946 Or above then you have the new bootrom. NOTE: 940-945 May Be New Bootrom!


Step 1. Connect your device and open iReb, put your device into DFU mode using the instructions and wait for iReb to finish. Once done open itunes.

Step 2. Hold Shift and left click the Restore button at the same time and select the 4.3 custom restore for your 3Gs, Now sit back and wait for the restore to complete.

Step 3. Once the restore has finished you may be stuck on the progress bar, just run iBooty and follow the directions for DFU mode again. Once done you are almost finished! You will need to run iBooty now every time you reboot or your device’s battery dies. This is only temporary until the untethered jailbreak is released.

Step 4. Now in order to unlock your device you will need to enter Cydia and set it up, then search for Ultrasn0w and install it. You will be asked to respring and once that is done you will be unlocked! Thanks for watching/reading and please subscribe to my youtube channels for more videos, Thanks!


Note: These custom firmwares are Hacktivated so if you do not have service on ATT then let me know so I can upload the unactivated versions.

Note: All of your data WILL be deleted if your device is working, so back it up!

A tip to increase battery: Go to settings, General, Restrictions and enable them then turn off Ping. This will save you about 1 hour of usage! You can also use SAM to fix battery issues: SAM Battery Fix

Related posts:

  1. How To Restore A 6.15.00 iPhone 3Gs/3G To Firmware 4.1 And Unlock!
  2. Jailbreak & Unlock 4.3 iPhone 4/3Gs iPod Touch 4th/3rd Gen & iPad Using Sn0wbreeze 2.3b4
  3. How To Unlock iPhone 4/3G/3Gs 4.0 Or 4.0.1 / 3.1.3 On 5.12.01/5.13.04 Baseband
  4. How To Jailbreak 4.3 iPhone 4/3Gs iPod Touch 4th/3rd Gen & iPad Semi Tethered – Sn0wbreeze 2.3b4
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