How to downgrade baseband 02.10.04 to 1.59.00

[https]

If you have installed 4.1 GM (beta) firmware on your iPhone 4, here are the instructions on how to downgrade it again. This has been tested only with iPhone 4. I think it doesn't work with 3GS, but you may try.

If you downgrade through iTunes back to 4.0.1 (using the saved shsh), you will get your phone locked in recovery mode. Just press the Kick button of TinyUmbrella to continue. But the problem there is that then the baseband will remain on 02.10.04.

To downgrade the baseband back to 01.59.00, just install the latest official firmware from Apple. This is 4.0.2. Don't install 4.0.1, because for 4.0.1 there are no certificates for the baseband available.

To install 4.0.2, make sure your hosts file is clean and doesn't contain the Saurik server entry (gs.apple.com). Remove that line, if it is there. Then restart iTunes. If TinyUmbrella was running, close it and check the hosts file again. Make 100% sure that you connect directly to Apple and not to your localhost (127.0.0.1) or to Saurik. If everything is fine, install official 4.0.2 firmware and its baseband. It shouldn't stop in the middle, requiring the Kick again. If that happens, iTunes probably connected to Cydia and Cydia couldn't provide the certificate for the baseband.

If you successfully installed 4.0.2 without the need to Kick the device out of recovery loop, then you probably downgraded your baseband successfully also. Activate your phone and then downgrade the firmware back to 4.0.1. Then you can jailbreak and unlock again.

Be aware that this method only works as long as Apple still signs 4.0.2 firmware. They probably stop signing 4.0.2 on September 8, or when firmware 4.1 comes out. So if you are on 4.1 GM and want to downgrade your baseband, do so now. As soon as 4.1 is officially out, use TinyUmbrella (version 4.1.xx, not out yet) to update to 4.1 without updating the baseband.

(Press Thanks button if this helped.)

[eagle7cr]

escuse my english, I´m from Costa Rica

I´m from those who installed the 4.1 in my iphone 4g, baseband 2.10, the devise is jalbreaked but doesn´t work with the phone company of this country

I tried the procedurs you give, but don´t really understand a little thinks

you said "make sure your hosts file is clean and doesn't contain the Saurik server entry (gs.apple.com)." and also said "Make 100% sure that you connect directly to Apple and not to your localhost (127.0.0.1) or to Saurik."

SO, the question is, the hosts line most not have any of this information, this because my computer´s host only says this:

# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP ad******* to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

BUT DOESN´T WORK about your instruction

I apreciate your help, that it can be send to my e-mail eagle7cr@hotmail.com

thanks alot

Originally Posted by https

If you have installed 4.1 GM (beta) firmware on your iPhone 4, here are the instrmake sure your hosts file is clean and doesn't contain the Saurik server entry (gs.apple.com).uctions on how to downgrade it again. This has been tested only with iPhone 4. I think it doesn't work with 3GS, but you may tryMake 100% sure that you connect directly to Apple and not to your localhost (127.0.0.1) or to Saurik..

If you downgrade through iTunes back to 4.0.1 (using the saved shsh), you will get your phone locked in recovery mode. Just press the Kick button of TinyUmbrella to continue. But the problem there is that then the baseband will remain on 02.10.04.

To downgrade the baseband back to 01.59.00, just install the latest official firmware from Apple. This is 4.0.2. Don't install 4.0.1, because for 4.0.1 there are no certificates for the baseband available.

To install 4.0.2, make sure your hosts file is clean and doesn't contain the Saurik server entry (gs.apple.com). Remove that line, if it is there. Then restart iTunes. If TinyUmbrella was running, close it and check the hosts file again. Make 100% sure that you connect directly to Apple and not to your localhost (127.0.0.1) or to Saurik. If everything is fine, install official 4.0.2 firmware and its baseband. It shouldn't stop in the middle, requiring the Kick again. If that happens, iTunes probably connected to Cydia and Cydia couldn't provide the certificate for the baseband.

If you successfully installed 4.0.2 without the need to Kick the device out of recovery loop, then you probably downgraded your baseband successfully also. Activate your phone and then downgrade the firmware back to 4.0.1. Then you can jailbreak and unlock again.

Be aware that this method only works as long as Apple still signs 4.0.2 firmware. They probably stop signing 4.0.2 on September 8, or when firmware 4.1 comes out. So if you are on 4.1 GM and want to downgrade your baseband, do so now. As soon as 4.1 is officially out, use TinyUmbrella (version 4.1.xx, not out yet) to update to 4.1 without updating the baseband.

(Press Thanks button if this helped.)

[manoj_kc]

good post
can you tell us step by step please?/

[https]

Please read my post carefully. I mentioned: "Be aware that this method only works as long as Apple still signs 4.0.2 firmware. They probably stop signing 4.0.2 on September 8, or when firmware 4.1 comes out."

I other words, "game over".

[jmec]

Originally Posted by https

Please read my post carefully. I mentioned: "Be aware that this method only works as long as Apple still signs 4.0.2 firmware. They probably stop signing 4.0.2 on September 8, or when firmware 4.1 comes out."

I other words, "game over".

what the ********** is this ,we are in november 14 ... just wait for the release of the real unlock and stop guessing the date when its out, everybody says its the 1st of november ,its the 7th of november ,now its the 24th why dont you all wait and dont say s.h.i.t if you dont know anything about it ...

[tanimr2002]

hahahha baseband downgrade..omg omg...hahahhaha..u r funny man..omg baseband downgrade...hahahhaha..i cant stop lauging..lol...

[Bigbrothers2000]

Bro baseband will never be downgraded, dont tell bul**** here

[https]

Hey guys, baseband downgrade was possible when you upgraded through a beta. But that's long long ago. Someone digged out my old thread. Everything is true there, but now worthless, because beta signing is long over. Forget this thread!

[mrfixit]

u cannot downgrade baseband ur way, not even at the time when apple signed 4.0.2! dont tell lies here, do some research 1st b4 bs

[https]

Originally Posted by mrfixit

u cannot downgrade baseband ur way, not even at the time when apple signed 4.0.2! dont tell lies here, do some research 1st b4 bs

You could do that then. When you installed 4.1 beta it upgraded the baseband. And when you installed stock 4.0.2 while Apple was still signing it, it downgraded it. Actually this works just the same way you upgrade it. And: I did that, so it's not just theory. But hey, that's long ago.

I'm pretty sure, the same technique works today: If you install 4.2GM, you get baseband 3.10.01. When you install stock 4.1 afterwards, it will downgrade baseband to version 2.10.04. As soon as 4.2 final comes out and 4.1 will not be signed anymore, you cannot downgrade the baseband anymore.

If you don't understand this, don't blame me.

BUT: You're right, all this won't help anybody getting an unlock.

[dest]

I don't think you understood the guy. This was when 4.1 was BETA.

[linterna1]

Originally Posted by https

Please read my post carefully. I mentioned: "Be aware that this method only works as long as Apple still signs 4.0.2 firmware. They probably stop signing 4.0.2 on September 8, or when firmware 4.1 comes out."

I other words, "game over".

waste of time..........

[jedanmalicrni77]

This is not waste of time, because i just downgraded my baseband from 3.10 to 1.59. My iPhone is factory unlocked and first i updated to 4.2.1 and just dograde to 4.1 and get 1.59. This is not bull**** like you said, just try with apple server, not saurik!

Good luck

[Mogkupoppo]

Originally Posted by jedanmalicrni77

This is not waste of time, because i just downgraded my baseband from 3.10 to 1.59. My iPhone is factory unlocked and first i updated to 4.2.1 and just dograde to 4.1 and get 1.59. This is not bull**** like you said, just try with apple server, not saurik!

Good luck

is that an attack or defense for the OP? lol lol
what that stated is like a mixture of oil and water.
first of all 4.1 do not have baseband 1.59,
second if it is factory unlocked why downgrade,
third the trick will not work anymore in addition to most people don't seem to know what "beta" means or they are just trying to be trolls for lighting up fire.

[https]

Originally Posted by jedanmalicrni77

This is not waste of time, because i just downgraded my baseband from 3.10 to 1.59. My iPhone is factory unlocked and first i updated to 4.2.1 and just dograde to 4.1 and get 1.59. This is not bull**** like you said, just try with apple server, not saurik!

Good luck

I'm not sure what you are talking about, but it is not possible to downgrade baseband 3.10 to 1.59, not even with factory unlocked phones. And if it's unlocked, there's no need to downgrade anyway.

I'm the original poster by the way.