how can i jailbreak and unlock iphone 3g with baseband 02.30.03???

[yiannos9]

i have an iphone 3g with version 2.2.1 and modem firmware 02.30.03.
how can i jailbreak and unlock it so i can use my own carrier?
i have searched all over the web and i read many guides but i dont quite understand how i will do it or if its possible to do it because of the firmware which is 02.30.03

if anybody can help i would really appreciate it.

thanks

[hamsup1o]

Not sure if ultrasn0w will work but you can go to Cydia and download 3G Fuzzyband Downgrader which will downgrade your baseband to 02.28.00. Then install yellowsn0w (also from Cydia) to unlock.

[bytethese]

i have an iphone 3g with version 2.2.1 and modem firmware 02.30.03.
how can i jailbreak and unlock it so i can use my own carrier?
i have searched all over the web and i read many guides but i dont quite understand how i will do it or if its possible to do it because of the firmware which is 02.30.03

if anybody can help i would really appreciate it.

thanks
You don't. :)

You upgrade to 3.0 and use redsn0w and ultrasn0w.
http://blog.iphone-dev.org

[yiannos9]

Not sure if ultrasn0w will work but you can go to Cydia and download 3G Fuzzyband Downgrader which will downgrade your baseband to 02.28.00. Then install yellowsn0w (also from Cydia) to unlock.


i dont have cydia installed for some reason.
now what i do?

[yiannos9]

You don't. :)

You upgrade to 3.0 and use redsn0w and ultrasn0w.
http://blog.iphone-dev.org


my itunes dont recognise the phone and says that sim card is invalid .
so i cannot upgrade to 3.0 and make the steps to jailbreak through redsn0w.
how can i upgrade if itunes dont recognise the iphone?

[bytethese]

my itunes dont recognise the phone and says that sim card is invalid .
so i cannot upgrade to 3.0 and make the steps to jailbreak through redsn0w.
how can i upgrade if itunes dont recognise the iphone?

Have you already tried putting the device in DFU mode and restoring? That will upgrade you to 3.0. :) Then all you need is red/ultrasn0w.

[benflick]

Put the phone in DFU mode (http://www.iclarified.com/entry/index.php?enid=1034). iTunes will display a message that the phone needs to be restored. Shift+Click on restore (Option+click for Mac) and select the 3.0 firmware you downloaded.
Or you can remove the SIM card before connecting to iTunes so you can update/restore without DFU mode.

[lakshi]

Use latest itunes 8.2, download from apple site..