I just tried to jailbreak my iPhone 3G from Maxis (firmware 2.2.1) with QuickPwn-225-2 following these instructions from iClarified but was ultimately unable to make calls due to no telco signal was shown on the top left corner of the screen. Thinking it was because of the jailbreak, I resorted to:

1. Hard-reset (holding down both Home+Power for 10 secs). Result = no improvement.

2. Restoring my phone from iTunes backup. Result = no improvement.

3. Switching to DFU mode. Unplugged from PC, hold down Home+Power for 3 secs, slide to shutdown the phone. Then while holding Home, plug the device back into PC and iTunes automatically startup. It then downloaded latest firmware (2.2.1) by itself and updated the phone (you may need to unplug and plug back the phone once download has finished) and flash back to default state (everything will be wiped out and back to normal). And then it did something which it didn't do before, it displayed the message 'An update to the carrier settings for your iPhone is available. Would you like to download it now?'. And I clicked Yes. After that, it detected the phone as a new phone and gave me 2 options (1. Install as new phone, 2. Restore from backup). I chose 'Restore from backup'. Once that is done, everything was back to normal. Result = got back maxis signal.

Semi-conclusion: (Not yet tested)
I believe you can jailbreak the phone except you need to have your carrier settings already located in your iTunes folder BEFORE you start the jailbreak. Download the maxis carrier settings Maxis_my.ipcc and put the file in your iTunes folder located in:


^ for this folder path above, replace <username> with your username and is applicable to Windows XP.

Hopefully you will be more successful than I was

I will try this again next week, can't have the phone not working during this weekend.

This post has been edited by ZipD: Mar 27 2009, 04:30 PM

^How true

Ok, I re-tried jailbreaking again. This time it worked because iTunes detected that I needed new carrier settings and it downloaded the maxis.ipcc file for me. It didn't do this the first time around.

For those of you who has lost signal after jailbreaking, simply plug in your phone and start iTunes, click on your iPhone and hold down SHIFT + click Update button. Select the file type as 'iPhone Carrier Configuration Files (*.ipcc)' and browse to the 'Maxis_my.ipcc' file you've downloaded and extracted from Malaysian Telco Carrier Logos thread.

After you SHIFT+click the Update button, you need to change the file type (from the dropdown list) to 'iPhone Carrier Configuration files (*.ipcc)' then you'll see it.

This post has been edited by ZipD: Mar 30 2009, 06:55 PM

Here's what my screen shows when I do it:



Just out of curiosity, did you extract the IPCC file out first?