Update IOS

[drugdealer]

hello all,
i want to upgrade firmware version on iphone 3g but when i restore iphone n after the jailbreak i m unable to find network i dunno wot is baseband but is there anyone can tell me how to jailbreak n unlock iphone 3g 4.2.1 i have also tried to install ultrasnow but no solution

 

[Crystal-RX]

hello all,
i want to upgrade firmware version on iphone 3g but when i restore iphone n after the jailbreak i m unable to find network i dunno wot is baseband but is there anyone can tell me how to jailbreak n unlock iphone 3g 4.2.1 i have also tried to install ultrasnow but no solution

I believe when you upgrade your 3G iphone to 4.2.1, the baseband on it has also been upgraded to 5.15.04. Ultrasn0w currently does not work for this baseband.

You might want to use tiny umbrella to check your iphone to see what bootloader it has on it. If it has 05.08 bootloader, then you can downgrade its baseband to a lower one so you can unlock it with ultrasn0w. If its bootloader is higher than 05.08, then your only option to unlock it is to go with the ipad baseband.