How To Restore & Update 6.15.00 iPhone 3Gs to 4.3.3 Firmware & Unlock Untethered! - YouTube
Download iOS 6.1.6 for iPhone 3GS and iPod touch 4G
Apple releases iOS 7.0.6, iOS 6.1.6 with various bug fixes
Apple Starts Signing Firmware All the Way Back to iOS 6.1.3 Up till iOS 11.2 - Downgrade Now if You Want to Jailbreak!
How to officially downgrade your Apple iPhone 4s to iOS 6.1.3
How to Jailbreak iOS 6.1.3 with Redsn0w
iOS 6 IPSW [Direct Download Links] | OSXDaily
iOS 6.1.3 Released with Minor Fixes & Improvements [Download Links] | OSXDaily
Downgrading iOS 9.3.5 to iOS 6
IPhone 3GS Modem Firmware 05.16.08, Software Update iOS 6.1.6 Include With Casing. Working In Good Condition. Speaker On Off Button All In Working Condition., Computers & Tech, Parts & Accessories, Networking on Carousell
Download iOS Firmware 6.1.6 Build 10B500 For iPhone 3GS
Unlock iOS 6.1.6 with Ultrasn0w Fixer For iPhone 4 / 3GS [Guide]
How to downgrade iPhone 3GS from iOS 6.1.6 to 4.1 - No blobs, No iPad Baseband - With Carrier - YouTube
Download iOS 6.1.3 Firmware For iPhone, iPad And iPod Touch
How to Downgrade iPhone 3GS iOS Firmware from 6.1.6 to 6.1.3 - YouTube
iOS 6.1.6 on the iPhone 3GS : r/ios
Download iOS 6.1.3 Final For iPhone, iPad, iPod touch [Direct links] | Redmond Pie