Use tiny umbrella + iTunes to downgrade easier

Cool bro  gonna try it later

Oops sorry didn't realize that . Anyway edited the post

Beta version bro ?

Guys , I have a iPhone 3GS running on 3.1.3 . I wanted to update to 4.2.1 . So can I straight update or must I go through 4.3.5 ?

Yup , I have all the major shsh . So can I update straight to 4.2.1 or must I update to 4.3.5 first then downgrade to 4.2.1

Tried to update my iPhone 3GS running on 3.1.3 to 4.2.1 but failed . This is what I do .

1. Save shsh , start TSS server .
2. DFU mode , connect iTunes .
3. Change host file.
4. Pointed to 4.2.1 .

But after that error 1015 , recovery mode . Tried to kick out using TU and Fixrecovery but failed . And finally I restored to 4.3.3 and it works . I wonder why ?

Guys found out this useful tips :

To jailbreak tethered 4.3.5 , you will need to point your firmware to 4.3.4 using redsnow . But actually you can jailbreak using firmware 4.3.5 as well. After pointing to 4.3.5 and everything is done , you will notice that your Cydia Icon is white colour and not working . But dont worry . To make it run again , Open redsnow , point to 4.3.5 again and this time instead of ticking " Install Cydia " , tick " Just boot tethered right now " . After that just let redsnow do the rest . After successful reboot , you should get a fully functional Cydia.

Hmm This a is rare case . It is not a big problem after all . There's not much game with size that more than 500 MB . Just avoid those game

Maybe its your host file, or maybe the latest firmware had been changed to iOS 5

Of course you can still use your cydia

Of course you will need to jailbreak again

iPhone 3GS on 4.2.1 and I'm happy with it. No point updating to iOS 5 . I have everything here : )

To fix a Cydia white icon problem , first you turn off your iPhone. Connect your iPhone to your computer and run redsnow . Browse for your current firmware . After it extract all the information , it will ask you what you want . Untick install Cydia and tick only Just Boot Tethered right now .After that Cydia will reboot your iPhone. You should have a brown functioning Cydia now .

So after you jailbreak semitethered , then when the untethered jailbreak is out , do you need to restore back to your current firmware first ? Or you can straight jailbreak again . And for the latest redsnow , firmware is not required to jailbreak and boot tethered right ? Thanks

You can straight update to iOS 5

You will need the SHSH blobs to restore to your current firmware which is not signed by Apple . If your iPhone is still working but with some bug, you can save your shsh using tiny umbrella right away . But if your iPhone is in Recovery Mode Boot Loop or whatsoever that makes Tiny Unbrella unable to detect your device, then you have no choice but to restore to the latest firmware first then after that downgrade using SHSH blobs .You can't just simply point to firmware 4.3.3 and expect it to work .

This post has been edited by victorian: Nov 10 2011, 09:45 AM

Are you sure iOS 5.0.1 untethered jailbreak has came out ? If yes I will update to iOS 5 today

Maybe you can try reinstalling iFile ?

Just updated my iPhone to ios 5.0.1 . Feels fresh with an unjailbroken phone. Now whenever a free game is announced, I will feel very excited. When I was using a jailbroken phone, I would possibly say: Nah, I can download any game for free anytime.

Yeah , gonna try that later