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Click on jailbreak and install Cydia option. When restore is complete and it reboots, press home+power key to force shutdown and reboot using the iBooty tool created by Sn0wbreeze in Step 7 which is now placed on your desktop. Use shift restore and select ipsw built by Sn0wbreeze. Close the Sn0wbreeze and use latest iREB to put phone in Pwned DFU mode. At the end of it, it asks you to put your phone in DFU. Sn0wbreeze will prepare the ROM (takes some time). When it asks for 6.1.3 appticket, pass on shsh blobs for 6.1.3 (This mode will preserve baseband too, so don’t worry). Prepare Custom ipsw through Sn0wbreeze with option iFaith. Proceed below only if you are willing to risk a tethered jailbreak for 6.1.3 

Now you have a working iPhone 3gs on iOS 4.1 untethered and you can unlock it from Ultrasn0w.If putting DFU mode from Cydia doesn’t work, try putting it in DFU mode through iREB) Now your Phone is on iOS 4.1 and Baseband 5.13.04. Once Jailbroken, run Redsn0w0.9.15b1 – select ios4.1 from extras and deselect Install Cydia and select downgrade from iPad baseband.Now your Phone is on iOS 4.1 and Baseband 6.15.00. Jailbreak using Redsn0w V0.9.14 b2– Select option Install Cydia and Install iPad Baseband.Now your Phone is on iOS 4.1 and Baseband 05.16.08, since baseband cannot downgrade via iTunes. Start TinyUmbrella TSS Server and use iTunes 11 to flash stock 4.1 onto iPhone (hold shift key while selecting restore from iTunes and select 4.1 iOS). Put your iPhone in Pwned DFU mode via iREB (Dark screen with no logo). Run all tools as “run as administrator” on windows. Make Sure you have shsh blobs of 6.1.3 present (in case you want to go to 6.1.3 in step6). Make sure of the versions of software mentioned. Thumb Rule: Make sure your internet connectivity is present throughout.But if your phone in manufactured in 2011 (exact date please Google it), then DONOT ATTEMPT THIS. You can do the same even if you have old Bootrom (that is in fact a boon since you’ll get untethered jailbreak of 6.1.3). That upgraded my baseband to 05.16.08 and left me with a locked phone. I had accidently updated iPhone from iTunes to 6.1.3. I have 3Gs with New Bootrom but manufactured before 2011.