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Can I downgrade iOS 5 back to iOS 4?

Try put your iphone in DFU mode for doewngrading, and the baseband of the iphone probably wont be downgraded like always.
 
try iOS 5

I guess if you do not have a developer account, it's not possible to try the iOS. If it's true, is it possible to give your slots so other people can try. Because on the xsellize forum, a guy is selling 2.5$ per slot. This is scam of actually true and possible to do that?

thanks
 
ogerwolf said:
I guess if you do not have a developer account, it's not possible to try the iOS. If it's true, is it possible to give your slots so other people can try. Because on the xsellize forum, a guy is selling 2.5$ per slot. This is scam of actually true and possible to do that?

thanks
Click to expand...

I think each developer can register 2 or 3 ios device with his/her ID, so if a developer wants he/she can give apple your ios serial number and you are good to go. it only depends if he is telling the truth.
 
ikaveh said:
I think each developer can register 2 or 3 ios device with his/her ID, so if a developer wants he/she can give apple your ios serial number and you are good to go. it only depends if he is telling the truth.
Click to expand...

As a developer, you can actually register 99 devices. Of course, if you give your UDID (not serial number) to a developer and they add it for you, there's nothing stopping them subsequently deleting it and leaving you high and dry with a device that you can't update to future betas.
 
Phil A. said:
As a developer, you can actually register 99 devices. Of course, if you give your UDID (not serial number) to a developer and they add it for you, there's nothing stopping them subsequently deleting it and leaving you high and dry with a device that you can't update to future betas.
Click to expand...

Phil -

If this does indeed happen, Dev pulls your UDID, are you stuck with iOS5b1 or do you need to restore to iOS4.3?
 
green94 said:
Phil -

If this does indeed happen, Dev pulls your UDID, are you stuck with iOS5b1 or do you need to restore to iOS4.3?
Click to expand...

You'd be stuck with iOS5b1 until it expires (betas always have an expiry date in them), at which point you'd have to revert. It seems that it is possible to revert from B1 back to 4.3, but in the past some betas haven't been able to be reverted: if that happened, you'd effectively have a brick until the release of iOS5
 
Downgrading my 3GS right now.

Edit -

Scrap that, my 3GS baseband wasn't changed at all upgrading to iOS5 and back down to iOS4.3.3 :D
 
Ashin said:
Downgrading my 3GS right now.

Edit -

Scrap that, my 3GS baseband wasn't changed at all upgrading to iOS5 and back down to iOS4.3.3 :D
Click to expand...

Are you sure that baseband was downgraded too? Can someone confirm this with iphone 4?
 
zepica said:
Are you sure that baseband was downgraded too? Can someone confirm this with iphone 4?
Click to expand...

I never even looked what baseband it was on iOS5, according to the wiki on iOS, it should have upgraded to 05.20.00

After downgrading, it says "05.16.02" which is the iOS 4.3.3 stock baseband for 3GS

Either way, very happy to have 4.3.3 and baseband
 
I guess for 3gs on ios5 baseband is new too, but will wait until someone confirm is this safe for i4.
 
Anyone else downgraded?

If so, go to General and About, and tell us what modem firmware you now have.


iOS 4.3.3 basebands should be -

3GS - 05.16.02
iPhone 4 - 04.10.01
 
Cellular Service will NOT work if you use Gizmodo's hack to bypass registration

I can confirm that it is possible to upgrade the iPhone 4 and use the Gizmodo hack to gain access to iOS 5 but the Cellular Service will NOT work. I believe that my baseband has been updated too...
More details: donaldhays.tumblr.com


Also, a downgrade is currently in progress to 4.3.3. Will update if unsuccessful. Apple signed for it...
 
donaldhays said:
I can confirm that it is possible to upgrade the iPhone 4 and use the Gizmodo hack to gain access to iOS 5 but the Cellular Service will NOT work. I believe that my baseband has been updated too...
More details: donaldhays.tumblr.com


Also, a downgrade is currently in progress to 4.3.3. Will update if unsuccessful. Apple signed for it...
Click to expand...

Great, let us know what is baseband version after downgrade.
 
I see that downgrade is successful for everyone, but can you please check what is your baseband version now?
 
Downgrade iOS 5.0 on CDMA iPhone4

I'm trying to restore my CDMA iPhone 4 from iOS 5.0b to 4.2.8 (the latest signed .ipsw from Apple, so SHSH blobs not needed?) and keep receiving error 1601 when using DFU mode.

I've tried to do this in both iTunes 10.3 (latest) and 10.5 (dev version) and keep getting the same error. Would be grateful for any thoughts you guys might have because I've heard that it is possible to downgrade but am unable to do so myself. Thank you for your help.
 
Check your hosts file, maybe it's cydia servers there... and maybe that will solve your problem.
 
I've downgraded my iPhone 4 GSM from 5.0b1 to 4.3.3 and can confirm that the baseband gets downgraded as well. Pretty cool! Didn't even have to use DFU mode, recovery mode worked just fine. No errors or anything.
 
Downgrade iOS 5.0 on CDMA iPhone4

zepica said:
Check your hosts file, maybe it's cydia servers there... and maybe that will solve your problem.
Click to expand...

I verified that the hosts file did not contain the Cydia servers, still getting the same error unfortunately.
 
Downgrade iOS 5.0 on CDMA iPhone4

zepica said:
Try with another usb port.
Click to expand...

I tried that and received the same error. Also tried "Recovery Mode" instead of DFU as some folks above had suggested and received error 1603 instead of error 1601.

Thankfully I'm able to use recboot to kick the device out of recovery mode and it's fully usable; however, it's still on the 5.0b instead of actually downgrading.

Again, I'd be very grateful for any help you all can provide. Thanks very much to zepica for your responses and suggestions.

For those who're considering upgrading to 5.0b, the notifications platform is amazing; however, the deal-killer for me so far has been the battery life, which is significantly worse.
 
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