My experience with Iphone 3gs, 3g downgrade 4.0.2 to 4.0.1 or 4.0

[jatsun]

Hey,
All of you out there who are looking for the answer whether i can downgrade my 3gs & 3g from 4.0.2 to 4.0 or not I can safely say that it's partially possible

This is what happened with me when i tried downgrading a 3g & 3GS

3g
I have successfuly downgraded an official Indian Vodafone 3g 4.0.2 to 4.0.1 without any shsh files.
Just a simple shift+restore restore

3gs
I had a unknown 3gs on 3.0.1 with an 3.0.1 shsh. I wanted it to update it to 4.0.1 for multi tasking feature etc...but was receiving error 3194
so i read here http://forum.gsmhosting.com/vbb/f456...0-1-a-1079649/ & I updated to 4.0.2 then downgrade it as mentioned above and did all the host editing etc., somebody has also posted a youtube video on 5~7 page of the above thread for easier execution
I tried downgrading using the procedure on the above link from 4.0.2 to 4.0.1 but it didn't work
i still was receiving error 3194
then i read this http: The truth about shsh
and randomly tried 4.0 since 4.0.1 was failing......and voila!!!!!
it worked
I successfuly downgraded an initial 3.0.1 upgraded to 4.0.2 back to 4.0

to summarise the downgrade
3g- directly restore to 4.0.1 no other worrying aspect
3gs- upgrade to 4.0.2...try the 1stl ink to restore to 4.0.1 if dat doesn't work...simply restore to 4.0

(Please brothers....upgrade to 4.0.1 only if u have no other option or if u know the risks involved...as it's just not worth all dis mess)

[Hincey]

I did a 3gs the other day from 3.1.2 to 4.0.1. You don't have to upgrade to 4.0.2 to go back to 4.0.1. I used TinyUmbrella, backed the files up, selected 4.0.1 and then ran the TSS server. And then restored it in itunes (shift+restore). Job done

[NOKIA127]

In 3G and 3GS is same process.

Downgrade with iTunes to 4.0.1 and. Jailbreak/unlock

Nokia127

[pabloariel]

Can you explain it better? when I try to downgrade a 3g 4.0.2 to .0.1 or .0.0 always get error from itunes
Thanks

[Johnessen]

Originally Posted by Hincey

I did a 3gs the other day from 3.1.2 to 4.0.1. You don't have to upgrade to 4.0.2 to go back to 4.0.1. I used TinyUmbrella, backed the files up, selected 4.0.1 and then ran the TSS server. And then restored it in itunes (shift+restore). Job done

I have done a lot of 3gs upgrades with this method and all worked fine, but i don´t if it will work by downgrading from 4.0.2 to 4.0.1, but upgrading works

[jatsun]

Originally Posted by pabloariel

Can you explain it better? when I try to downgrade a 3g 4.0.2 to .0.1 or .0.0 always get error from itunes
Thanks

i simply restored my 3g on 4.0.2 to 4.0.1 via itunes 10, & it restored directly without any tinyumbrella or shsh server.......so i'll suggest u either try on latest itunes........or u can try on another pc

Also try DFU mode it helps...........

all d best!!!

[https]

Hey guys: iPhones 3G are not protected by firmware upgrade/downgrade. You can always install any version you want. The problem is only that since 4.0 firmware (iTunes 9.2 and higher) iTunes does such a check. So if you want to install a new (or old) firmware through iTunes, you also need shsh backups. But if you don't have it, you can still install the firmware by another tool, like redsn0w. And redsn0w is the preferred method for 3G anyway, as it also does the jailbreak at the same time.

[https]

Originally Posted by Hincey

I did a 3gs the other day from 3.1.2 to 4.0.1. You don't have to upgrade to 4.0.2 to go back to 4.0.1. I used TinyUmbrella, backed the files up, selected 4.0.1 and then ran the TSS server. And then restored it in itunes (shift+restore). Job done

That's absolutely correct. There's no need to upgrade to 4.0.2 first.

[https]

Originally Posted by jatsun

i simply restored my 3g on 4.0.2 to 4.0.1 via itunes 10, & it restored directly without any tinyumbrella or shsh server.......so i'll suggest u either try on latest itunes........or u can try on another pc

Also try DFU mode it helps...........

all d best!!!

That's completely wrong:
a) You need shsh backup in any case. So if it worked for you, you simply had shsh backup on Cydia server. Maybe you just didn't know.
b) DFU mode is only necessary if iTunes doesn't detect your device otherwise. It doesn't "help" in any way to downgrade.

[https]

Originally Posted by Johnessen

I have done a lot of 3gs upgrades with this method and all worked fine, but i don´t if it will work by downgrading from 4.0.2 to 4.0.1, but upgrading works

There is absolutely no difference between an upgrade or downgrade. It doesn't matter what version was installed before the restore. If you can install 4.0.1, then you can also install the latest version (currently 4.0.2) and then downgrade back to 4.0.1.

The only difference is the baseband. There is currently no technique to downgrade the baseband. So once you upgraded to 4.1 with the newer baseband and have shsh backups for 4.0.1, you can downgrade again, but the baseband firmware will remain on the one for 4.1. Baseband for 4.1 is currently not unlockable, that means you cannot use other carriers. So beware of updating to 4.1 which should be released in a few days.

[https]

Originally Posted by jatsun

to summarise the downgrade
3gs- upgrade to 4.0.2...try the 1stl ink to restore to 4.0.1 if dat doesn't work...simply restore to 4.0

That worked because you had shsh backups for 4.0 on Cydia. In that sense you were lucky. But unlucky because Cydia didn't get your 4.0.1 backup. Normally Cydia gets higher versions automatically for you. But because there are now millions of shsh backups on Cydia and 4.0.1 was out for only a few days (actually a little more) it didn't get it for all phones. You had to do it yourself to be sure.

And don't forget to get shsh for 4.0.2 now before you cannot get that anymore in a few days (when 4.1 comes out).

Originally Posted by jatsun

(Please brothers....upgrade to 4.0.1 only if u have no other option or if u know the risks involved...as it's just not worth all dis mess)

You can check with TinyUmbrella if Cydia has your shsh backup. Just click Advanced, select Cydia, and the firmware version you want to check. Then click the button to get the backup. If it succeeds, Cydia had your shsh backup and you can always restore that firmware.
Or, if you have a jailbroken device and can run Cydia program, check the top lines: If it says 4.0.1 there, then Cydia has 4.0.1 backup and you can always install that firmware on that iPhone whenever you like.

[ZIYAAD STRYKER]

samehere wiz 3gs 4.0 works great but restart???? is it hard or soft problem??

[https]

Originally Posted by ziiyyaad

samehere wiz 3gs 4.0 works great but restart???? is it hard or soft problem??

If you restored successfully and device is in recovery loop afterwards, you can run TinyUmbrella and click the button "Kick Device Out of Recovery" (or use another tool for that).

The problem is that after installation of the firmware iTunes wants to install the baseband and the baseband cannot be installed again, because you need special certificates for it. That problem exists since 4.0 firmware.

(click thanks button if this helped)