Stuck on iOS 5 with baseband 5.16.05? Read on as this may be the solution for you.
First of all, please be aware that untethered jailbreak for iOS 5 is not yet available and baseband 5.16.05 can’t be unlocked.
However, it is still possible to unlock your iPhone by updating the baseband to 6.15.00. This is an iPad baseband which can break your GPS. Read the risks here. if you don’t fancy 6.15.00 then these guys can replace baseband chip.
Did you read and understand all the risks? OK, let’s proceed.
Strangely, Apple is still signing iOS 4.1 which you need to downgrade your iPhone 3GS to. The reason why you need to downgrade to iOS 4.1 first is so that you can update your baseband to 6.15.00.
[Final warning: Proceed at your own risks!]
Steps:
1. Backup your contacts, photos, apps etc. Remove your SIM card.
2. Download iOS 4.1 firmware for iPhone 3GS.
3. Download redsn0w 0.9.8rc18 for Windows or Mac.
4. Download latest version of TinyUmbrella from here.
5. Remove iTunes 10.5 and install iTunes 10.4 or earlier.
5. Launch iTunes, connect your iPhone, hold down the SHIFT for Windows or Option for Mac while you click the RESTORE button in iTunes and select the iOS 4.1 firmware file you have just downloaded.
6. The restore will end with error 1015 and recovery loop on the iPhone, this can be resolved using the “Exit Recovery” button in TinyUmbrella.
7. start redsn0w 0.9.6rc18.
8. Browse for the iOS 4.1 firmware you just downloaded.
9. Select ‘Install Cydia’ and ‘Install iPad Baseband’. Warning: installing iPad baseband will break your GPS.
10. Follow on screen instructions to put your device into DFU mode to begin the jailbreak.
11. when the process is done, you will find that your iPhone is now jailbroken on iOS 4.1 with iPad baseband 6.15.00. To make sure you can always go back to iOS 4.1, launch Cydia and select ‘Make my life easier.’
If you’re happy with iOS 4.1 and would like to unlock it, skip to step 17 now.
Still up to the challenge? Let’s update it to iOS 5 and then unlock it with ultrasn0w 1.2.4. We’re more than half way there!
12. Download custom iOS 5 for 3GS from here.
13. Download the latest redsn0w from the Dev Team’s website or from here. start redsn0w, go to Extras > Pwned DFU. This allows your iPhone to accept custom firmware.
14. Reinstall iTunes 10.5.
15. Connect your iPhone to your computer and hold shift+restore (Windows) or option+restore (Mac) and select the custom iOS 5 IPSW you just downloaded.
16. Once the restore is done, your iPhone will now have iOS 5 with baseband 6.15.00.
Note: Once your iPhone has booted up you will see new setup screens. when you start iOS5 for the first time, you’ll be asked about Location Services. Be sure to select “Disable Location Services” when asked in the setup, you’ll have the chance to turn on Location Services again when asked if you want to use “Find my iPhone”. It’s fine to turn it back on at that point, if that’s your desire (or you can always go in and enable it in Settings.app).
17. Launch Cydia from Springboard (home menu).
18. Search for ultrasn0w on Packages in Cydia. if you cannot find it, add new sources by typing ultrasn0w repo:
repo666.ultrasn0w.com (with zero, not o).
19. Install Ultrasnow 1.2.4.
20. Reboot your iPhone. Please note that since the jailbreak is tethered it may not boot up properly (stuck on Apple logo). if this happens, start redsn0w 0.9.9 again, go to Extras > Just Boot. Follow on screen instructions.
21. Turn off 3G and insert your SIM card. it should pick up your mobile signal.
Not too difficult right? if you follow the exact instructions this will work 99%.
Good luck and leave your comments or questions below.
Did it work? Buy me a beer! Never required but always appreciated!
Tags: Jailbreak 5.16.05, Jailbreak Baseband 5.16.05, Unlock 5.16.05, Unlock Baseband 5.16.05, Unlock iPhone 3GS ultrasn0w 1.2.4, Unlock Modem Firmware 5.16.05, Update 5.16.05 to 6.15.00, Update Baseband 5.16.05 to 6.15.00
This entry was posted on Saturday, October 15th, 2011 at 11:42 am and is filed under Baseband, Cydia, IPSW, Jailbreak, Redsn0w, Restore, SHSH, Sn0wbreeze, TinyUmbrella, Ultrasn0w, Unlock, iOS 4.1, iOS 5, iPhone 3GS, iREB, iTunes. you can follow any responses to this entry through the RSS 2.0 feed. you can leave a response, or trackback from your own site.