how to downgrade from 3.13 to 3.12 again?
 

i hv already update new firmware with new one 3.13 but now i want to downgrade to firm 3.12

please help me, how to downgrade ?


thx

i am not 100% sure but i think not possible to downgrade i phone



br
sandeep

Posible but baseband downgrade not posible now..

Use redsnow latest version i hope it will allow u to downgrade

:D:D:D:D:D:D:D:D
baseband downgrade imposible for redsn0w...

Impossible Bro :D:D:D:D:D:D:D

Only hardware and software is posible ;)

It is not possible to downgrade the baseband n I dont think there is any solution available for the latest baseband, correct me if I m wrong.

BR

how to downgrade if it posible

not downgrade baseband and not unlockable now wait dev team

use custom firmware 3.1.2 to downgrade firmware.

restore with 3.1.2
boot with quickpwn
run blackra!n
finally phone jail breaked but no service :)

That is what everyone is saying here, it is possible to downgrade the firmware but not the baseband.

BR

i mean FIRMWARE... not a baseband, i know baseband impossible to downgrade, but i nedd a solution how to downgrade the firmware from 3.13 to 3.12 ?

helooo, what should i do and where to download, please tell me step by step

HOW TO: Downgrade iPhone 3Gs From Firmware 3.1.3 to 3.1.2

Apple and the iPhone evolved a lot in the past couple of years and they learned a couple of things when it comes to software protection against jailbreaking.
iPhone 3GS have to communicate with Apple’s servers before allowing the installation of any version of firmware (restore or update ) .With the release of Firmware 3.1.3, Apple’s server has stopped certifying all previous firmware and this makes it impossible to restore your device to a previous release. The certification is done through 3 files called IBSS, IBEC and ECID that, once signed, are a kind of “green light” to install the firmware through iTunes.
IBSS and IBEC files are generated during a firmware restore in iTunes and placed into a temporary folder on your computer. You will have no problem on retrieving this files, but the missing piece of this puzzle is the ECID file that Apple doesn’t allow you to retrieve.





NOTE: this tutorial is aimed ONLY to iPhone 3Gs users that have saved their ECID file through Cydia. If you are not sure about saving your ECID file throught Cydia, than load Cydia and on the homepage check if you see this message: This iPhone 3Gs has an ECID SHSH on file.
How To Downgrade iPhone 3Gs from Firmware 3.1.3 to 3.1.2

1. find a file called “hosts” that manages connections to the servers:

* Windows: go to C:\Windows\System32\drivers\etc\ and use a text editor to open the file “hosts”
* Mac: open a terminal an type sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts





2. At this point we connect the server address to the IP address that corresponds to Saurik’s server instead of Apple. This way we can trick iTunes anxious to check the firmware saved through Cydia. To do this just copy this string and add it to the end of the file “hosts” that we have just opened: 74.208.105.171 gs.apple.com





2.1 Save the file. Do NOT do a “Save As”. Close the file.

2.3 In a new terminal window, paste in: sudo dscacheutil -flushcache .Hit return and type in your admin password.

3. Now you can step into the real downgrade process of your iPhone 3Gs, but it will not be as easy as the previous times. First of all you need to put the iPhone in DFU then: Plug it into your computer and simultaneously press the Home key and the Power button for 10 seconds exactly, after issuing only the power button and continue to click on Home until iTunes will not recognized a new device in recovery mode.

4. Your iPhone should have a full black screen and NOT the screen with iTunes icon and the cable. Many people confuse it with the DFU recovery mode but they are two very different processes, so before you continue, make sure you have the screen all black.

5. Now click on the ALT key (MAC) / SHIFT (Windows) of the keyboard and the button “Restore” in iTunes, select the firmware 3.1.2 and wait.
NOTE1: During recovery you may experience various errors.

NOTE2: If you get ” unknown error (3002) ” error, you ddidn’t save your ECID on Saurik’s server and pretty much the downgrade cant take place. Luckily it was found an exploit in iPhone FW 3.1 and with a little bit of patience you might be able to perform the jailbreak directly on iPhone Firmware 3.1

NOTE3: If you will get this error: ” The iPhone “iPhone” could not be restored. An unknown error occured (1015) ” , accept it, and re-do the entire process. ( put the iPhone into DFU mode, select iPhone FW 3.0 and wait ). The process will fail again and iTunes will return the same message as before “The iPhone” iPhone “could not be restored. An unknown error occurred (1015).Do not panic because it’s completely normal.
To resolve this situation can proceed in two ways: The first relates to Mac users and is using iRecovery ( Mac and Windows ) to reboot the device, it will re-ignite in normal mode, the second title is “universal” because it works on both Windows and Mac and is ignoring the ‘error, continuing to work normally. Therefore, there can only start and run a regular Redsn0w Jailbreak Firmware 3.0
You’re done. Now you are back on iPhone OS 3.1.2 and can jailbreak your iPhone. Of course, those of you that depend on unlocking the iPhone, you are screwed anyway, because by updating to 3.1.3 in the first place, you updated your baseband.
COPY-PASTE Form other forum
Credits goes to SOH20-other forum vip and moderator

MY PROBLEM IS :

hi since frimware 3.1.3 out I HAVE PROBLEM TO RESTORE IPHONE 3GS 3.0 TO 3.1.2 I HAVE THE FIMWARE BUT I CANT RESTORE THE PHONE TO HAVE 3.1.2 IN MACK ME : this device isn't eligible for the requested build

what can i do now ?

VODAFONES read this:

HOW TO: Downgrade iPhone 3Gs From Firmware 3.1.3 to 3.1.2

Apple and the iPhone evolved a lot in the past couple of years and they learned a couple of things when it comes to software protection against jailbreaking.
iPhone 3GS have to communicate with Apple’s servers before allowing the installation of any version of firmware (restore or update ) .With the release of Firmware 3.1.3, Apple’s server has stopped certifying all previous firmware and this makes it impossible to restore your device to a previous release. The certification is done through 3 files called IBSS, IBEC and ECID that, once signed, are a kind of “green light” to install the firmware through iTunes.
IBSS and IBEC files are generated during a firmware restore in iTunes and placed into a temporary folder on your computer. You will have no problem on retrieving this files, but the missing piece of this puzzle is the ECID file that Apple doesn’t allow you to retrieve.





NOTE: this tutorial is aimed ONLY to iPhone 3Gs users that have saved their ECID file through Cydia. If you are not sure about saving your ECID file throught Cydia, than load Cydia and on the homepage check if you see this message: This iPhone 3Gs has an ECID SHSH on file.
How To Downgrade iPhone 3Gs from Firmware 3.1.3 to 3.1.2

1. find a file called “hosts” that manages connections to the servers:

* Windows: go to C:\Windows\System32\drivers\etc\ and use a text editor to open the file “hosts”
* Mac: open a terminal an type sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts





2. At this point we connect the server address to the IP address that corresponds to Saurik’s server instead of Apple. This way we can trick iTunes anxious to check the firmware saved through Cydia. To do this just copy this string and add it to the end of the file “hosts” that we have just opened: 74.208.105.171 gs.apple.com





2.1 Save the file. Do NOT do a “Save As”. Close the file.

2.3 In a new terminal window, paste in: sudo dscacheutil -flushcache .Hit return and type in your admin password.

3. Now you can step into the real downgrade process of your iPhone 3Gs, but it will not be as easy as the previous times. First of all you need to put the iPhone in DFU then: Plug it into your computer and simultaneously press the Home key and the Power button for 10 seconds exactly, after issuing only the power button and continue to click on Home until iTunes will not recognized a new device in recovery mode.

4. Your iPhone should have a full black screen and NOT the screen with iTunes icon and the cable. Many people confuse it with the DFU recovery mode but they are two very different processes, so before you continue, make sure you have the screen all black.

5. Now click on the ALT key (MAC) / SHIFT (Windows) of the keyboard and the button “Restore” in iTunes, select the firmware 3.1.2 and wait.
NOTE1: During recovery you may experience various errors.

NOTE2: If you get ” unknown error (3002) ” error, you ddidn’t save your ECID on Saurik’s server and pretty much the downgrade cant take place. Luckily it was found an exploit in iPhone FW 3.1 and with a little bit of patience you might be able to perform the jailbreak directly on iPhone Firmware 3.1

NOTE3: If you will get this error: ” The iPhone “iPhone” could not be restored. An unknown error occured (1015) ” , accept it, and re-do the entire process. ( put the iPhone into DFU mode, select iPhone FW 3.0 and wait ). The process will fail again and iTunes will return the same message as before “The iPhone” iPhone “could not be restored. An unknown error occurred (1015).Do not panic because it’s completely normal.
To resolve this situation can proceed in two ways: The first relates to Mac users and is using iRecovery ( Mac and Windows ) to reboot the device, it will re-ignite in normal mode, the second title is “universal” because it works on both Windows and Mac and is ignoring the ‘error, continuing to work normally. Therefore, there can only start and run a regular Redsn0w Jailbreak Firmware 3.0
You’re done. Now you are back on iPhone OS 3.1.2 and can jailbreak your iPhone. Of course, those of you that depend on unlocking the iPhone, you are screwed anyway, because by updating to 3.1.3 in the first place, you updated your baseband.

COPY-PASTE Form other forum
Credits goes to SOH20-other forum vip and moderator

@VODAFONES

it's verry easy if I good undertand you, you have an V3.1.3 with modem 05.12.01 and you need downgrade it to v3.1.2, don't forget you can't downgrade the modem, so after you have a strange phone with v3.1.2 and modem v05.12.01,

you just need download iRed software from ih8sn0w.com, run iRed software, choose you phone with press button of your phone, and after this run iTune and with shift button choose the firmware v3.1.2 you want restore, and normaly you can restore you iphone with out anny probleme,

if in the end you an error like 1050, don't worry, just run a software like blackr1n for active your phone,

but I think it's impossible to unlock this modem, if I'am wrong correct me pls :D

Best Regards,
JAVA Good.

no i dont think it is possible to downgrade

http://i583.photobucket.com/albums/s...3gs-erro2r.jpg

THIS IS MY PROBLEM when i try to downgrade with JAVA GOOD method, anyway.... now my iphone stuck on ..how to return to normal mode ?

i hv tried :-(

my help it's for a 3G, if you have a 3Gs, I think you can restore it with the last version with out chose the firmware, iTune instale automaticly, or maybe I don't understand you ?

Best Regards,
JAVA Good.

ANYONE.... how to back to NORMAL MODE.... iphone normal mode, forget to jailbreak right, i need to back normal mode

thanks

for put it in normal mode you need last version of iTune, just press restore file and with the software, and after this you need put an original sim card,

now they have a situation when you can't, this situation it's if your phone is BLACKLISTED, for this you can't put it in normal mode, they have this solution but I 'am not if work, and if work after this you need see if your country block the phone with IMEI or no.

Best Regards,
JAVA Good.

To resolve this situation can proceed in two ways: The first relates to Mac users and is using iRecovery ( Mac and Windows ) to reboot the device, it will re-ignite in normal mode, the second title is “universal” because it works on both Windows and Mac and is ignoring the ‘error, continuing to work normally. Therefore, there can only start and run a regular Redsn0w Jailbreak Firmware 3.0
You’re done. Now you are back on iPhone OS 3.1.2 and can jailbreak your iPhone. Of course, those of you that depend on unlocking the iPhone, you are screwed anyway, because by updating to 3.1.3 in the first place, you updated your baseband.
Give it a go as i have said before-read and read again.

@VODAFONES

I have the same probleme with you, I have an 3Gs with Version 3.1.2 and iTune software don't accept for restaure the same version, maybe is appele want forced all peopel to update the handset with out tell ot dirrctely,

if I find a solution a share it, so if anny one have this solution help me pls :D,

Best Regards,
JAVA Good.

maybe this thread can help you

Best Regards,
JAVA Good.

AGRee............
Cant do it

Simple process

Conect the i phone in recovery mode

Select the ipsw with 3.1.2 and restore it with i Tunes

After restoring the i phone, firmware restore process will begin and in few seconds u will get error 1015 and the process will stop.

Now close the iTunes and use blackra1n to jailbrake the i phone and u are done...

Ur version is 3.1.2 but modem baseband pain, u cant downgrade it///

Thts why u got the erroe while downgrading modem firmware ..

All the best

Cheers

for 3Gs unfor.. no solution tell now

hard process but thanks alot ........

nice info pro .......