Apple Releases iPhone Firmware Update 3.1.2, Fixes Network Issues but Breaks Jailbreak
2:38 pm, October 8th, 2009, Sayam Aggarwal

Apple has just released a new firmware update, version 3.1.2 for the existing iPhone and iPod Touch range, which contains no new features but fixes an important issue with cellular network reception. The new software fixes dropped cell connections until the iPhone is restarted, according to Apple.
However, it looks like the update does contain a new baseband version in order to fix the issue, therefore if you have an unlocked iPhone 3G or iPhone 3GS, do not update until there is confirmation from a trusted source, like the iPhone DevTeam. If you’re planning to jailbreak, you should wait as this firmware version is currently incompatible with the latest jailbreak tools. But updates will soon be released to resolve the compatibility problem, according to the iPhone DevTeam.
The complete-ish list of changes, according to Apple’s cryptic update notes, is as documented below:
- Resolves sporadic issue that may cause iPhone to not wake from sleep.
- Resolves intermittent issue that may interrupt cellular network services until restart.
- Fixes bug that could cause occasional crash during video streaming.
Clearly, it indicates no new features, unless there are some hidden ones.
To download the new firmware for your iPhone, select the model below to download it directly from Apple’s server or open iTunes and click iTunes –> Check for Updates in the menu bar.
Posted by Sayam Aggarwal in Apple, News, iPhone, iPhone 3G, iPhone 3G S, iPod Touch | Comment on this article











Cellular Data Network settings are gone.
solar, on October 8th, 2009 at 2:54 pm
well, i was going to jailbreak this weekend, but since i need to install 3.1.2 to get rid of the “coma” issue i guess i’ll have to wait to jailbreak for the dev team to catch up.
firesign3000, on October 8th, 2009 at 3:25 pm
Does it break my Jailbreak, for real??????????????
/facepalm
IndianFAIL, on October 8th, 2009 at 4:37 pm
After updating, there is a dialog box asking permission to update the carrier settings. This is different than the carrier settings that enabled MMS.
I had been having trouble with my visual voicemail (read: it stopped working completely) after enabling tethering and then updating to 3.1. I eventually deleted the mobileconfig file I downloaded from benm.at, and visual voicemail was working again. Of course, tethering was gone, but my visual voicemail was more important. Now, I’ve updated to 3.1.2 and applied the carrier settings afterward. Believe it or not, the tethering option is back! Does this mean AT&T will be enabling tethering very soon? I have yet to try it out, but it is interesting.
RayCon, on October 8th, 2009 at 9:09 pm
Update failed the first time and scared the crap out of me. Luckily there was an update done before that. Second update works fine, can’t wait to give it a try in the subway tunnels in Singapore and see I get better reception than before.
Bertrand, on October 8th, 2009 at 10:56 pm
Like a freaking idiot, when I plugged my phone in just to sync calendars, I innocently clicked OK to the sweet suggestion to update my iPhone…. after discovering that all my cool stuff was gone and I was back to the boring iPhone display, only then did I start reading about the warning NOT to update yet…
I really miss my MUB theme… waiting for the Dev Team’s update to jailbreak… good lesson to learn
Cathy, on October 9th, 2009 at 10:35 pm
I was wondering why my AV cables don’t work anymore after updating to 3.1. Anyone know how to get around this problem? or if this will be fixed in the future?
Jason, on October 10th, 2009 at 8:04 am
For those of you that regret updating ur already jailbroken device into an unjailbroken version 3.1.2, id try youtube, it tell you how downgrade ur version number so then u can update to 3.1.1 and jailbreak again.
Fearlessszk, on October 11th, 2009 at 3:52 pm
For third party AV cables if you are using the 3.0 or higher software, you need to purchase the Apple cords. I did, fortunately I found a set on ebay for way less than Apple charges.
Dennis, on October 27th, 2009 at 2:33 pm