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Downgrade Iphone 3g baseband 5.12.01 on 3.1.3 Firmware
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IMPORTANT: This video is for those who have IPhone 3g with Bootloader 5.08. Many users who have upgraded their Iphone 3g to 3.1.3 firmware have lost there Unlock as well. Meaning they are not able to use it with T-mobile or any other Un-Official Carriers. The reason being 3.1.3 Firmware upgrades the baseband from 5.11.07 to 05.12.01 and this 05.12.01 cannot be unlocked with Blacksn0w. But only at one condtion as described in this video that you have to have Iphone 3g with 5.08 bootloader.
In order to check what bootloader you have, First You need to have a Jailbroken Iphone 3g.
Jailbreaking Video of iphone 3g on 3.1.3 firmware can be found here :
Then from Cydia download "Fuzzyband" which is going to tell you what Bootloader you have and you are lucky or not. If YES , then you will be successfully downgraded from 05.12.01 to 04.26.08. Then you can simply use "Ultrasnow" to Unlock your Iphone 3g and use any Un-Official GSM Sim card while having 3.1.3 Firmware in your Iphone 3g. This 'Ultrasnow' is available for download in Cydia.
ANY IPHONE 3G BUILT BEFORE SEPTEMBER 2008 HAS BOOTLOADER 5.08 IN ITS SYSTEM. LATE COMERS DON'T.
If u cannot find "Fuzzyband" in your Cydia then Please add this source in cydia "http//apt.steffwiz.com/" then install "All Sources" then find it you will see it.
The above does not apply for Iphone 2g or 3gS. Only Iphone 2g users can successfully update to 3.1.3 Firmware and Unlock it with two bootloader files that is 3.9 and 4.6. Since, Iphone 3gS has 6.02 or higher bootloaders so its not going to work for Iphone 3gS.
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