Guide Downgrade iPhone3GS 6.15 Baseband Using Redsn0w

[mobileinfo]

The iPhone Dev-Team as promised has released an updated version of redsn0w that will allow iPhone3GS and iPhone3G users to downgrade their device's iPad baseband 6.15 which was performed in order to unlock the devices. This however casued certain unexpected issues like battery drainage and loss of GPS in iPhone3GS. It was mandatory to flash iPad's 6.15 baseband on iPhone3G and 3GS as that was the only unlockable baseband that could be unlocked using iPhone Dev-Team's Ultrasn0w unlock. Musclenerd made an announcement earlier that a tool will be released in future that would allow the possibility of downgrading iPhone3GS and 3G basebands to an unlock-able version.

Having said that, today the iPhone Dev-Team proudly announced the release of updated Redsn0w that allows the users to downgrade their basebands. Since playing with basebands is not cool, we decided to prepare an easy to follow instructions guide to downgrade 6.15 baseband.



Steps To Downgrade iPhone3GS & 3G 6.15 Baseband



Step
1
Download the latest version of Redsn0w and the current firmware of your device

Step
2
Extract the contents of the Redsn0w archive that you just downloaded.

Step
3
Connect your iPhone3GS or 3G and Launch Redsn0w.
(Windows7 users should select the option of running as administrator by right clicking on redsn0w application and then selecting the option - Run as administrator)

Step
4
In the redsn0w, go to extras menu

Step
5
From the extras menu, select 'Select IPSW' option



Step
6
Navigate to the folder where you download the current firmware of your device and select the firmware and click open.

Step
7
Click Ok to confirm the firmware selection



Step
8
Select 'Yes' if your iPhone3GS is newer model or else select 'No'
Put your device into DFU mode











Step
9
Now go back to the main menu and select the option 'Jailbreak'

Step
10
The jailbreak process will begin and then Redsn0w will show more options where you need to select 'Downgrade From iPad Baseband' and then click next.






Step
11
Put your device into DFU mode

• Power off the device completely
• Hold power button for 3 seconds
• without releasing the power button, press and hold home button for 10 seconds.
• Now release the power button and continue holding the home button .

Redsn0w will use limera1n to exploit your device to enter into pwndfu mode. Once done, continue with the steps. Redsn0w will now start processing your device's build



Step
12
Redsn0w will now inform you that the rest of the process will happen in your device.

Step
13
Your device should show some scrolling text and then you should be able to see the pineapple logo indicating 'Flashing Baseband (don't interrupt). Its serious, don't unplug or do anything stupid or you'll never be able to use your device again.



Step
14
Once done, your iPhone will reboot and you should have 5.13.04 baseband.


Done!


If you have any questions or facing any issues, post them in the comments section





If you have any comment related to improvement of my thread presentation comment down,If you like my thread Hit Thanks

[jaydipdigital]

Can we use this tool for 3gs new baseband chip what not supported for update ipad baseband

[mobileinfo]

Originally Posted by jaydipdigital

Can we use this tool for 3gs new baseband chip what not supported for update ipad baseband

it support new bootloder but it not support new bb chip

[derbitel_mkd]

not work with new baseband chip
mobileinfo whose faster.....

[de Bell]

can this downgrade the newer 3g or 3gs with the newer baseband chip

[shahjee]

tried on 3gs , 4.1 baseband still 6.15 and only on searching , tried reinstall redsnow but same

[shahzadthe1]

Originally Posted by shahjee

tried on 3gs , 4.1 baseband still 6.15 and only on searching , tried reinstall redsnow but same

[ DOWNLOAD ] RedSn0w 0.9.14b1 - DownGrade 6.15 to 05.13.04

[hossnemamun]

no bad affect create ???

Post again tested result.

BR
Hossne Mamun

[sunshine4u]

can i use this method on 3gs new bootrom with baseband 5.16 ??? is it safe to downgrade from 5.16 to 5.13 ???

[derbitel_mkd]

i think no one read,and i dont have idea why
No you cant downgrade from any other baseband,only from 6.15
No you cant upgrade modem firmware to ipad baseband and downgrade for new baseband chip.
So this solution is only for users who have already installed ipad baseband and iphone in work condition.imei,wiif,modem,etc.......
So spend few minuts for reading smth usefull......

[nobal1976]

can we recover imei lost of new bb 3gs with downgrade baseband?

[hossnemamun]

yes. need help for BB and imei corrupted can recover ?

any can do this?


BR,
Hossne Mamun

[JMJ ALBERT]

tried 4times to downgrade my 3gs 6.15 but no luck
no sim detected and not downgraded to 5.13
now my 3gs searching only ....

tried to install baseband again
check install cydia
back to normal my 3gs working again...

cannot downgrade to 5.13 baseband...

[mobileinfo]

@albertprimoblan
just wait for the next beta icoder will fix the issue he assure he will narrow the bugs

[tombox68]

Yahoooooo worked for me on 3g 8gb was on 4.2.1 6.15 now 4.2.1 05.13.04


cheers