If you are an iPhone 3GS user who has accidentally upgraded to iPhone OS 3.1.3 as you weren’t aware of the warning given by the iPhone Dev Team to avoid upgrading to iPhone OS 3.1.3 then there is some more bad news.
Folks at BigBoss are reporting that iPhone 3GS users who had accidentally upgraded to iPhone OS 3.1.3 can’t downgrade to iPhone OS 3.1.2.
To restore an iPhone 3GS, you need a signed firmware file. Folks at BigBoss are reporting that Apple has stopped signing iPhone OS 3.1.2 from today, which means that iPhone 3GS users cannot restore using iPhone 3.1.2 or older firmware files. They can only restore using iPhone 3.1.3 firmware file.
According to them:
That means those of you 3gs or iPod Touch 3 users that did not rush out and store your TSS in Cydia or Rock are screwed and cannot restore anything but 3.1.3.
If you are a jailbreak user running a 3gs or ipod touch 3 (or later generation ipod touch 2) that has not stored the TSS in cydia, you should be very careful with what you do from now until the next jailbroken firmware. You will want to be careful in what you install to make sure you don’t have to restore for any reason. It would be a good idea to install open SSH and learn how to use it so that you can get in and fix any problems without a restore, also.
iPhone 2G and iPhone 3G users don’t need to worry as they don’t need signed firmware files.
iPhone 3GS users will now have to wait for iPhone Dev Team or Geohot to jailbreak iPhone OS 3.1.3.
We’ll let you know as soon as we have any further updates.[via BigBoss]