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How to fix some mysterious problems.

I'm on iOS 5 and the latest baseband.

I just wonder if there would be any problems if I downgrade using this baseband? (using stock IPSW, then I'll use jailbreakme to jailbreak.)

I'm asking this because I know there used to be some iOS/baseband version combos which simply didn't like eachother so they caused problems. ALSO there also are some cases like iPhone 3GS on baseband 06.15.00 then downgrading from stock 4.3.5 to stock 4.1, resulting in permamently lost radio and therefore permamently lost phone capabilities. Are there, when it comes to the iPhone 4?

I'd like to ask whether or not there are any problems using the latest (04.11.xx/the one included with iOS 5 final) baseband with iOS 4.3.3?

note to some of you: no, I no longer have 04.10.01, as it seemed to cause some problems for me while I was on iOS 5 final (redsn0w custom w/ bb preserved) so I restored to stock iOS 5. (and no, the 4.3.5 signing window is not opened anymore, so BB downgrade is not possible) but I have 4.3.3 shsh as well.

asked 21 Oct '11, 12:02

i4user's gravatar image


edited 21 Oct '11, 12:19

Baseband/Firmware Mismatch problems have always been there. Now you're going down from a Major OS Update to 4.3.3

You would be able to restore to 4.3.3, but there might be network issues.


answered 21 Oct '11, 12:06

raviraj%20jailbreak%20guru's gravatar image

raviraj jailbreak guru

edited 21 Oct '11, 12:07

Yes. Do you know about such specific ones?

(21 Oct '11, 12:08) i4user i4user's gravatar image

Ya, "No Service" etc.

(21 Oct '11, 12:10) raviraj jailbreak guru raviraj%20jailbreak%20guru's gravatar image

Should I expect my radio to break or just a temporary issue that everything goes back to normal by restoring to stock iOS 5?

(21 Oct '11, 12:11) i4user i4user's gravatar image

nothing like radio break, just small tiny little issues.

(21 Oct '11, 12:12) raviraj jailbreak guru raviraj%20jailbreak%20guru's gravatar image

Oh, OK. Thanks then.

(21 Oct '11, 12:13) i4user i4user's gravatar image

You should create a custom IPSW using sn0wbreeze in the "Baseband Preservation Mode" and then restore to it in PWNED DFU + TSS Server.....then you can jailbreak using

(21 Oct '11, 12:14) raviraj jailbreak guru raviraj%20jailbreak%20guru's gravatar image

If you have a factory unlocked phone then 4.11.08 is still compatible with 4.3.3..however u must use a signed custom firmware from snowbreeze using ur shsh to downgrade.

i just did it

mine was a factory unlocked iphone 4 ios 5

downgraded to 4.3.3 using snowbreeze

itunes asks to activate and activates the phone again


answered 31 Oct '11, 13:29

rotastrain's gravatar image


Thanks. Do you have any problems regarding to this baseband mismatch? like... network issues etc?

(BTW: I'm not unlocked at all, but I don't really require an unlock right now. So assuming I'm on my official carrier, is it safe for me to downgrade to iOS 4, while carrying this new baseband (since I can't downgrade that one))

The thing you are saying is interesting, since the other tread that's linked here says it doesn't work at all with iOS 4.

(31 Oct '11, 13:31) i4user i4user's gravatar image

Even factory unlocked you can NOT use ios 4.x.x with ios 5's baseband. Will not register on the network even.

You are welcome to try, worst it will need is a restore to stock ios 5

(31 Oct '11, 13:40) theiphoneguy ♦ theiphoneguy's gravatar image

I posted down in detail what u got to do to make it work il post a pic here later of my phone running perfectly with signal on 4.3.3 and on modem 4.11.08

(31 Oct '11, 16:59) rotastrain rotastrain's gravatar image


I AM ON BASEBAND 4.11.08 my firmware is 4.3.3 I have a full signal bar of vodafone I am sending SMS mms calling ,FaceTime everything.

There are two ways to downgrade the phone and I will explain both ace Aeolus here for netter understanding

your a factory unlocked iPhone 4.u have your saved shsh.u are on iOS 5 BASEBAND 4.11.08.

You can do two things

1.start tiny umbrella TSS server.restore in iTunes.U will land up with a error 1. Then use redsnow to jailbreak it and let it also fix the recovery. Your phOne will then boot BUT you will have no carrier and one signal bar.BASEBAND locked.

This is the no go scenario which I went through first.

Option 2 which works

Your back on iOS 5 as u just screwed up. Now use ifaith to cook a custom firmware using your shsh.let ifaith put u on pwned dfu Restore in iTunes make sure you don't have the tiny umbrella tss server on and even uncheck that option in the advanced settings which points servers to Cydia Wallaaaa

Your phone will reboot and iTunes asks u to continue and says congratulations your phone has been unlocked

Il post a pic up here later


answered 31 Oct '11, 16:57

rotastrain's gravatar image


You should maybe read this thread, might explain it a bit, it's not looking good from what I can make out.

jbguru - "You would be able to restore to 4.3.3, but there might be networkissues."

i4user - "Do you know about such specific ones?"

jbguru - "Ya, "No Service""

Rofl ^^^^, pretty pointless downgrading then.


answered 21 Oct '11, 14:14

venusanann's gravatar image


lol, many people had such 1 signal issues.

(21 Oct '11, 14:16) raviraj jailbreak guru raviraj%20jailbreak%20guru's gravatar image

did they get service then?, could make calls?

(21 Oct '11, 14:17) venusanann venusanann's gravatar image


(21 Oct '11, 14:17) raviraj jailbreak guru raviraj%20jailbreak%20guru's gravatar image

let OP try once, let's see what happens. OP can always go back to iOS5.

(21 Oct '11, 14:18) raviraj jailbreak guru raviraj%20jailbreak%20guru's gravatar image

Well let him try then, I'd like nothing more than for it to be possible, otherwise all the shsh's i have for my iphone 4 may as well go in the trash

(21 Oct '11, 14:23) venusanann venusanann's gravatar image
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Asked: 21 Oct '11, 12:02

Seen: 4,921 times

Last updated: 23 Nov '11, 08:40

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