downgrade 6.15.00 to 05.13.04 baseband process information and updates !
iPhone Baseband Downgrade has already been released thanks to the Dev Team who has released updated Redsn0w for baseband downgrade RedSn0w 0.9.14b1 which will downgrade the iphone 3Gs and iPhone 3G baseband from 6.15.00 to 05.13.04 baseband for iPhone 3G / 3GS.
downgrade 6.15.00 to 05.13.04 baseband process has been released and you can now downgrade the basebands so what is the benefits of downgrade 6.15.00 to 05.13.04 baseband process? the best part is all the GPS releated issues will be solved now and not only this but also downgrade 6.15.00 to 05.13.04 baseband process will support the Ultrasn0w 1.2.7 for unlocking for iPhone
iPhone Dev Team’s release information for downgrade 6.15.00 to 05.13.04 baseband process
“The iPhone Dev Team is happy to announce a baseband downgrade option in redsn0w for those who are using the iPad’s o6.15 baseband on the iPhone3G or iPhone 3GS.
Typically you’d have the 06.15 baseband if you unlock with ultrasn0w but updated your iPhone baseband past 05.13.04. With this new capability, you can now downgrade specifically from 06.15 to 05.13.04 (even if you never had 05.13.04 on that device before). This gives you the best of both worlds: ultrasn0w compatibility and a normal iPhone baseband with full GPS and the ability to use stock IPSWs again.
Here are the steps:
Step 1. Use the “Extras=>Select IPSW” button in redsn0w to tell it which firmware version you have installed (new-bootrom 3GS users can usually skip this step but it doesn’t hurt for them to do it too).
Step 2. Do a controlled shutdown of your iPhone (“slide to power off”). This step is very important to avoid mount problems when the ramdisk is running!
Step 3. Go back to the first screen and click “Jailbreak“. Enable the “Downgrade from iPad baseband” checkbox, disable Cydia if you already have it installed, and click Next to proceed through the normal DFU ramdisk steps.
After the ramdisk gets launched and you see the Pwnapple running on your iPhone, you’ll eventually get to the “Flashing Baseband” step. THIS STEP TAKES A VERY LONG TIME to complete and there won’t be any feedback while it’s running. Please just let it be for the next 3-8 minutes! When the ramdisk has done its job it will reboot the phone on its own.
For those who are wondering if you can update your 3G or 3GS to 06.15 solely for the purposes of downgrading to 05.13.04, the answer is “yes” for 3G owners, and “maybe” for 3GS owners. The iPad is not compatible with 3GS units manufactured week 34 of 2011 or later. If you have an iPhone 3GS and if digits 3-5 of its Serial Number are 134 or later (xx134…), then you should NOT try to install the 06.15 baseband on your 3GS! It will brick your radio, preventing both the downgrade from working and normal iPhone software from using it as a phone! Be warned!”
downgrade 6.15.00 to 05.13.04 baseband process using Redsnow
Step 1: You need to have the latest Redsn0w.
Step 2: Connect your iPhone to the Computer and then put into DFU mode which is tutorialized in the process to Put it into DFU mode.
Step 3: Once you are done with above steps you need to click “Jailbreak“, Select “Downgrade from iPad baseband”, unselect Cydia and then proceed further and then once completed you will get a “Flashing Baseband” message.
Step 3: You are done and iphone 3Gs and iPhone 3G downgrade 6.15.00 to 05.13.04 baseband process completed
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