Whenever Apple releases the update to iPhone’s firmware, the first question that iPhone Jailbreakers and/or Unlockers ask: Is it safe to upgrade? Well, in this latest release of iPhone 3.1 firmware update, DO NOT UPGRADE TO IT YET!

Important

Now you can do untethered Jailbreak of your iPhone 3G/3Gs running latest firmware 3.1.3 with "Spirit".

Step by Step iPhone and iPod Touch (All models) Firmware 3.1.3 Jailbreak Guide Using Spirit

The reason being simple: Your IPSWs will be changed from 04.26.08 in iPhimageone OS 3.0 to 05.11.07 in iPhone OS update 3.1 so stay back from update and wait for the dev-team to release the PwnageTool.

If you update to the newer OS 3.1 then you stand a confirmed chance of losing your Jailbreak and any future chance of unlocking if you haven’t done that yet. And if you have Jailbreaked as well as unlocked and then upgrade to OS 3.1 then you lose both and any future chance of unlocking it again! So be warned. And yes, it’s not suitable for both iPhone 3G and 3Gs users.

For all others, you can download the new OS 3.1 which comes with these new features:

  • Genius Recommendations for Apps
  • Genius Mixes
  • Download Ringtones Wirelessly
  • Organize Apps in iTunes
  • Improved syncing for music, movies, TV shows, podcasts, and photos
  • iTunes U content organization
  • Redeem iTunes Gift Cards, codes, and certificates in the App Store
  • Display available iTunes account credits in the App Store and iTunes Store
  • Save video from Mail and MMS into Camera Roll
  • Option to "Save as new clip" when trimming a video on iPhone 3GS
  • Better iPhone 3G Wi-Fi performance when Bluetooth is turned on
  • Remotely lock iPhone with a passcode via MobileMe
  • Use Voice Control on iPhone 3GS with Bluetooth headsets
  • Paste phone numbers into the keypad
  • Option to use Home button to turn on accessibility features on iPhone 3GS
  • Warn when visiting fraudulent websites in Safari (anti-phishing)
  • Improved Exchange calendar syncing and invitation handling
  • Fixes issue that cause some app icons to display incorrectly

iPhone/061-6609.20090909.mwws4/iPhone2,1_3.1_7C144_Restore.ipsw">Download iPhone OS 3.1 firmware for iPhone 3GS
iPhone/061-6600.20090909.AwndZ/iPhone1,2_3.1_7C144_Restore.ipsw">Download iPhone OS 3.1 firmware for iPhone 3G
iPhone/061-6605.20090909.PQ3ws/iPhone1,1_3.1_7C144_Restore.ipsw">Download iPhone OS 3.1 firmware for iPhone 2G

[via MuscleNerd’s Twitter page]