Monday, June 18, 2012

How To Downgrade iPhone3GS 6.15 Baseband Using Redsn0w

How To Downgrade iPhone3GS 6.15 Baseband Using Redsn0w


redsn0wbbdowngradeThe 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.

Update 1 : Musclenerd Confirms iPhone3GS 6.15 Baseband Downgrade - Redsn0w To Be Updated Soon


Update 2 : Happy Independence Day - New Updated Redsn0w Releasing Today

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

redsn0w-baseband-downgrade

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

how-to-downgrade-6.15-baseband

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
iPhone_baseband_Downgrade

Step 8 : Select 'Yes' if your iPhone3GS is newer model or else select 'No'
Put your device into DFU mode
DowngradeiPhone6.15baseband

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

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.
basebanddowngradetutorial

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

Downgrade-6.15-baseband

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.

iPhonebasebanddowngrade

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


Update 1 : Baseband Downgrade Troubleshooting Guide

Update 2 : Revised Steps For Successful Baseband Downgrade


Step 1 : Use iTunes to restore stock Apple iOS 5.1.1 (9B206) IPSW.
Step 2 :  Run Redsn0w 0.9.14b1.
Step 3 :  Select Clear Cache from "Extra's > Even More" page.
Step 4 :  Select IPSW from "Extras" page and select the location of your iOS 5.1.1 (9B206) IPSW.
Step 5 :  Power Down the iPhone (slide to power off).
Step 6 :  Click Jailbreak and tick only the "Install Cydia" option.
Step 7 :  Enter DFU mode and allow Redsn0w 0.9.14b1 to Jailbreak your iPhone and install Cydia.
Step 8 :  Re-Run Redsn0w 0.9.14b1.
Step 9 :  Select Clear Cache from "Extra's > Even More" page.
Step 10 :  Select IPSW from "Extras" page and select the location of your iOS 5.1.1 (9B206) IPSW.
Step 11 :  Power Down the iPhone (slide to power off).
Step 12 :  Click Jailbreak and tick only the "Install iPad baseband" option.
Step 13 :  Enter DFU mode and allow Redsn0w 0.9.14b1 to install the iPad baseband.
Step 14 :  When the iPhone reboots, either restore from iTunes backup or create a new phone to get access to Home screen and Apps.
Step 15 :  Run Cydia, wait for it to update and then install Ultrasn0w.
Step 16 :  Make sure the iPhone is activated and working with iPad baseband, e.g. make a test call.
Step 17 :  Re-Run Redsn0w 0.9.14b1.
Step 18 :  Select Clear Cache from "Extra's > Even More" page.
Step 19 :  Select IPSW from "Extras" page and select the location of your iOS 5.1.1 (9B206) IPSW.
Step 20 :  Power Down the iPhone (slide to power off).
Step 21 :  Click Jailbreak and tick only the "Downgrade from iPad baseband" option.
Step 22 :  Enter DFU mode and allow Redsn0w 0.9.14b1 to downgrade your iPhone baseband.


Update 1 : Musclenerd Confirms iPhone3GS 6.15 Baseband Downgrade - Redsn0w To Be Updated Soon 


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32 comments:

Anonymous said...

Have followed all the steps but my phone is getting stuck apple logo when rebooting, any ideas?

Anonymous said...

I got a no signal when it completed. Restored to IOS 5.1.1 again. Then, ran it a second time and it worked no problems. Thanks.

Anji said...

Still on BB 6.15 after 9 times trying. I lost signal after try downgrade but still on BB 6.15,it's only lost signal. Try restored original 5.1.1 it's lost signal have to use custom firmware however no signal again.

Can you guide me

Ehhmad said...

Hmm, that's strange. I was able to get it done in single attempt.

@Anji : Did the process complete normally ?

After downgrading you need to install ultrasn0w from Cydia to get the signal

Carlos Monteiro said...

I've tried 5+ times but no success downgrading the baseband :S

Mega mind said...

Make sure u choosing the correct boot rom (old or new version)

Anonymous said...

Still on BB 6.15 after 9 times trying. I lost signal after try downgrade but still on BB 6.15,it's only lost signal. Try restored original 5.1.1 it's lost signal have to use custom firmware however no signal again.

tip:use redsnow to make baseband 6.15 to get signal back

Anonymous said...

follow the steps as described, but intead downgrade 6,15 click install ipad baseband- had the same prob and this helped me get back my signal- 3gs 5.0.1snowbreeze

Ehhmad said...

Check Troubleshooting Page : http://www.geekyapple.com/2012/06/fix-iphone3gs-615-baseband-downgrade.html

Anonymous said...

Having looked at various sites and blogs, it would appear that almost everyone with iphone 3gs with ios 4.2.1 is having problems and cannot downgrade BB.
Also most people who are reporting success seem to be on IOS= 5.1.1

No one can give a definite answer as to whether the phone should first be on 5.1.1 for BB downgrade to work correctly.

My phone is Iphone 3 gs (manufactured week 34 - 2010)
IOS = 4.2.1
BB = 6.15
I have tried about 10 times so far and every time the results are exactly the same; BB downgrade process starts with the walking pineapple logo and then phone re-boots itself and is till on 6.15. I even tried installing Ipad baseband again and then tried to downgrade it but to no avail.

Regards
Scoot_eruk

Anonymous said...

i have iph 3gs bb 6.15 ios 5.1.1 (custom ios using sn0wbreeze). is there any issue on downgrading BB using redsn0w coz custom ios build using sn0wbreeze.

Ehhmad said...

There are issues downgrading baseband but before jumping on any conclusion, i'd suggest you to go through the update1 troubleshooting guide to check if you have followed everything

Anonymous said...

thanks Ehhmad, so i need to restore fresh ios 5.1.1 wid redsn0w & den dwngrd d BB to prevent any issues

Nepalese Boy

Ehhmad said...

Yes, perform a fresh restore, I've updated the post. Check the update above

Anonymous said...

Thank you n hope everything goes right way

Anonymous said...

does it works on iphone 3gs ios 4.3.5 tetherd jb

Anonymous said...

Tethered Jailbreak! Are you serious ?

Have you been sleeping all this time ??

You can update your iPhone to iOS 5.1.1 and jailbreak it using redsn0w , why stuck on tethered jailbreak still ?

:p

Anonymous said...

Step 1 : Use iTunes to restore stock Apple iOS 5.1.1 (9B206) IPSW.

I am already on 6.15 baseband (using 4.3.3 ios built with sn0wbreeze) is it okay for me to do a restore with stock apple ios 5.1.1 ???

Anonymous said...

my phone is hacktivated with sn0wbreeze.. if i install stock firmware the phone will get locked and my baseband chip will become unstable. reflashing with 6.15 will probably fix my unstable baseband chip but still i need to unlock. i have brought this phone from sweden and i dont have the original sim with me currently... i have hacktivated it and unlocked it with ipad baseband.. can you suggest steps proceeding with which i can downgrade baseband from 6.15 to 5.14?

Anonymous said...

I tried to skip the first few steps as I already had a jailbroked 5.1.1 using sn0wbreeze but kept getting "No Service". Tried again using ALL the steps and works perfectly. It may take a couple of minutes when flashing the baseband so don't panic. Thank you so much for this post.

Mobi said...

Hey Guyz its kind of emulation... after downgrading my baseband from 6.15 to 5.13.0 from above tutorial on my iphone 3gs(new Bootrom) i tried iforecast it showed my bb 6.15 and bl 6.4.......

Anonymous said...

how long does it take to get past the 'flashing baseband (don't interupt)'??

Ehhmad said...

For some it has even taken above 7mins..
If this does not work for you, I'd suggest you to wait until next week for Redsn0w Update

Check Update 1 Above

Mega mind said...

I have 3GS new bootrom 5.1.1. When I first tried to downgrade I ended up with 5.16 baseband. So I flashed the baseband again to 6.15 and tried to downgrade again and it worked like a charm. Next I installed ultrasn0w and boooom!! Unlock on 5.13.04. Musclenerd rocks!!

Mark said...

I have a 3GS 8GB with a SN of 87110xxx with a new bootROM (359.3.2 per redsn0w). I bought this phone very cheaply on eBay knowing that it might be bricked (IMEI = blanks, no Wi-FI and no Bluetooth) but expected that I would be able to use the new redsn0w to rollback the baseband and get it to work correctly. Can anyone verify whether it is possible to rollback the baseband with redsn0w for this phone? When I try to do a stock IOS 5.1.1 restore in iTunes it runs most of the way then consistently fails with "unknown error -1". I've tried the standard jailbreak/rollback the 6.15 baseband which didn't work and then installed the 6.15 baseband and then attempted the rollback which also didn't work.

Ehhmad said...

No redsn0w cannot resurrect bricked iPhones, if you try to upgrade you baseband with the latest firmware it will fail. There is no way redsn0w can establish a contact with your device and that's the reason why you get iTunes restore error 1 and when you try to flash a firmware that is cooked with sn0wbreeze or redsn0w, your restore will be successful but there won't be any wifi, bluetooth or baseband info.

Hate to burst the bubble but at the moment there is no fix for such devices. Musclenerd from iPhone Dev-Team has also said that redsn0w cannot establish a contact with bricket devices.

Think about this - how can the downgrade process begin when there is no baseband info? logically its not possible unless the dev-team comes up with some marvelous idea.

yeye_mbg said...

Me sirve si tengo un 3Gs new bootrom con ipad baseband??? Pueod hacer downgrade con exito?

Jonathan Mtawali said...

okay guys before i do it, i want to understand, my iphone 3gs is stuck at the activation screen after upgrading and restoring it to 5.1.1, so should i do the same process you guys are doing or there is another way? pliz help

Alejandro Ramirez said...

I am having the same Issue as Mark. This is upsetting me because I was doing this jailbreak and unlock for someone else and now I have nothing to give them. Just an iPhone 3GS stuck in DFU mode after I try doing anything to it. I used a custom 5.1.1 IPSW and the phone comes up but absolutely nothing works and I get a message that the iPhone needs to be restored. Also the baseband comes up blank. Is there a way I can get this device to work at least? I dont even want it jailbroken.

Luciano Sanches said...

Someone can help?
I have a 3GS USA NEWBOOT serial xx144xxx, and ios 6.0.1.
The SIMCARD isn't recognized with Brazil operator.
The oficial unlocked already done but still not working.
Today the baseband 06.15.00 is insatalled (I don't know why, because i read if this version is installed in newboot the iphone get brcked).
Is it possible change to 05.12.03 this iphone 3GS com baseband 06.15.00 with new boot?
Thanks

Noman said...

iphone 4s 64gb ios6 jailbreak not working.
But Bhy

Ehhmad said...

There is no jailbreak available for ios 6 yet

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