Downgrade Baseband 4.11.08 to 4.10.01 iPhone 4 on iOS 5 to Unlock with Gevey SIM (How-To)

[Miztory]

Downgrade Baseband 4.11.08 to 4.10.01 of the iPhone 4 on iOS 5.Unlock baseband 4.11.08 is not possible till now .Did you upgrade to iOS 5 with the stock IPSW file without taking in the consideration that it will update your baseband to 4.11.08 which not unlockable with the Gevey SIM or Ultrasn0w. The solution in this case is to downgrade the Baseband 4.11.08 to 4.10.01which is lockable with the Gevey SIM

Required downloads to downgrade Baseband 4.11.08 to 4.10.01 :
Download iTunes 10.4.1

Download iOS 4.3.5 for iPhone 4 .

Download TinyUmbrella .

Download iOS 5 for iPhone 4 .

For Mac users Download Redsn0w 0.9.9b5 .

For Windows users Download Sn0wbreeze 2.8b8 .

Download iTunes 10.5 for windows and mac .

How To Downgrade Baseband 4.11.08 to 4.10.01 :

Step 1 : Downgrade iTunes 10.5 to 10.4.1, check how to from here .

Step 2 : Put your iPhone 4 into DFU mode :

Hold the power button quickly and then while doing so you have to hold the home button too. After holding for a few seconds let go of the power button but keep pressing on the home button until the screen becomes black .

Step 3 : Start iTunes 10.4.1 and click on your iPhone 4 icon then click shift & restore (For Windows) or option & restore (For Mac) and point the stock iOS 4.3.5 .

Step 4: Wait until iTunes verify the iOS 4.3.5 on you iPhone and once completed you will need the official SIM card to activate it or you can use TinyUmbrella to confirm that your baseband is 4.10.01.



Step 5 : Start Sn0wbreeze 2.8b8 (Windows) or Redsn0w 0.9.9b5 (Mac) to build custom ipsw . Check how to do it from here .

Step 6 : Install iTunes 10.5 again .

Step 7 : Put your iPhone 4 into DFU mode again, and start iTunes 10.5 and click on your iPhone 4 icon then click shift & restore (For Windows) or option & restore (For Mac) and point the custom iOS 5 that you have built in step 5 .

Now your baseband will be preserved while running on iOS 5 and you can unlock it with Gevey SIM

Step 8 :Install the Gevey SIM on your iPhone 4 :

1:Insert the Gevey Sim in your iPhone 4 as shown below :



2:Turn on your iPhone 4 and wait for the Sim welcome menu , then Click Accept

3: Wait for 15 seconds , Then Call 112 and hang up within 2 seconds .

4:Go to Setting and Turn on the Airplane mode and turn it off right away.Now you will see “SIM Failure” message on your iPhone and then you will see “No SIM Card Installed” .

5:Now again you have to turn on the Airplane Mode and turn it off right away again until the “No SIM Card Installed” message shows up. Now you will see ‘SIM Failure’ message and after few seconds the signal will show up.

Now your done, enjoy your unlocked iPhone 4 on iOS 5.

[Yumraaj]

This tutorial is NOT for Downgrading, it's for preserving instead.

[cooldayr]

Can you confirm that this works?

[unlock_512me]

doesnt work

[cooldayr]

Originally Posted by unlock_512me

doesnt work

Thought so, the baseband is no longer being signed so it can only go up not down. I believe that it is impossible to downgrade unless apple signs it (going from a beta firmware to a non beta)

[Yumraaj]

Originally Posted by cooldayr

Can you confirm that this works?

Why do you think it will work?

1. He is trying to downgrade the firmware which isn't being signed!

2. I understand that you can downgrade but only if you have blob.

3. This will only work if Apple was still signing the 4.3.5 firmware because apple not only sign the firmware they also sign the baseband as well.

4. Why do we get stuck in recovery mode after a downgrade? It's because of a baseband crash due to baseband didn't get modified!

Let's hope I am wrong and those poor people who need a lower baseband can really enjoy this! But I've got a feeling that this will not work.

[cooldayr]

Originally Posted by Yumraaj

Why do you think it will work?

1. He is trying to downgrade the firmware which isn't being signed!

2. I understand that you can downgrade but only if you have blob.

3. This will only work if Apple was still signing the 4.3.5 firmware because apple not only sign the firmware they also sign the baseband as well.

4. Why do we get stuck in recovery mode after a downgrade? It's because of a baseband crash due to baseband didn't get modified!

Let's hope I am wrong and those poor people who need a lower baseband can really enjoy this! But I've got a feeling that this will not work.

Technically you can downgrade to 4.3.5 without the blob with an older iTunes
This is because without iTunes 10.5 or higher 5.x.x can not be downloaded

The baseband however I don't see downgrading

[bianchin69]

Originally Posted by cooldayr

Technically you can downgrade to 4.3.5 without the blob with an older iTunes
This is because without iTunes 10.5 or higher 5.x.x can not be downloaded

The baseband however I don't see downgrading

incorrect you CAN downgrade with the latest itunes

[homelessz]

I bet the OP just saw this tut somewhere when the 5.0 was first released. Then copy and paste here without knowing this tut no longer works.
Yes it worked, I done it at least 10 time on different iphone 4... Until apple stopped signing for 4.3.5.
PS: You still can downgrade with iTune 10.5 though (with blobs saved).

[Miztory]

yeah it used to work and i got it here only for those who rely on the gevey and have the blobs ready
for all others it won't do any good
so enjoy what u have

[cooldayr]

Originally Posted by Miztory

yeah it used to work and i got it here only for those who rely on the gevey and have the blobs ready
for all others it won't do any good
so enjoy what u have

Yes but what I am is saying is no matter what it won't work!

[mohseen]

it is not possible because apple is signing the baseband also so we can't just downgrade our baseband ya but we can downgrade our frimeware with out downgrading itunes. I have did it many times from ios 5 to 4.3.3 with latest itunes 10.5 and worked like a charm.

best,

[gigsona]

i tried and its not working on new itunes and on old itunes too if you havent blobs.. so maybe its working for them who has saved blobs.

[Miztory]

yeahh thats right

[grapgunit5290]

any word that when the unlock wil b out

[Miztory]

no idea

[yukiey]

this trick not working anymore because apple not signing 4.3.5 anymore,,,,

[Miztory]

i know it needs blobs

[cooldayr]

Not only does the method not work without SHSH blobs, it doesn't work at all

[Miztory]

dosen't matters
if this dosen't works
we cann always flash the ipad bb