First of all, please be aware that untethered jailbreak for iOS 4.3.5 is not yet available. however, the good news is that you can downgrade to iOS 4.1 as strangely, Apple is still signing this iOS version.
Secondly, there is no software unlock available for baseband 5.16.02. Your only way out is to update it to iPad baseband version 6.15.00, which has some risks. Please read carefully.
Steps:
1. Backup your contacts, photos, apps etc.
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. Launch iTunes, connect your iPhone, hold down the SHIFT key while you click the RESTORE button in iTunes and select the 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 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.
12. Launch Cydia from Springboard (home menu)
13. 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).
14. Install Ultrasnow 1.2.3.
15. Reboot your iPhone.
To make sure you can always go back to iOS 4.1, launch Cydia and select ‘make my life easier.’
Tags: Unlock iOS 4.3.5 3GS
This entry was posted on Saturday, August 20th, 2011 at 5:06 pm and is filed under Baseband, Cydia, IPSW, Jailbreak, Redsn0w, Restore, SHSH, TinyUmbrella, Ultrasn0w, Unlock, iOS 4.1, iOS 4.3.4, iOS 4.3.5, iPhone 3GS, 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.