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Wan to update i Phone 4 or i Phone 3GS to update latest i OS without updating i Phone baseband to unlock it later using Ultra Sn0w or Gevey SIM? These are the steps to update i Phone 4 or i Phone 3GS to latest i OS firmware without updating the baseband.Red Sn0w brings the Restore feature to update i Phone i OS without updating the baseband.Jailbreak i Phone 3G/3GS 3.1.3 with Spirit or Redsn0w 0.9.4 or Pwnagetool 3.1.5, You can unlock i Phone OS 3.1.3 with Ultrasn0w 0.92. Sandip Dedhia is the founder of Blogsdna.com, he loves to write on technology, gadgets & web services.
The i Phone OS 4.0 firmware was released yesterday atÂ WWDCÂ 2010 event by apple along the new i Phone 4.
These are the steps to preserve i Phone 3GS, i Phone 4 baseband while updaing to i OS 5 firmware…
Make sure you have i Tunes 10.5 installed and then connect your i Phone to your computer and backup your personal suff via i Tunes.
The guide is applicable for Upgrading i Phone from any OS version below 4.0 (3.0,3.1.2 or 3.1.3) to 4.0 and also for i Pod Touch. Do not disconnect your i Phone until the update has finished That’s it, Once update is finished your will have i Phone 3G/3GS running latest i Phone OS 4.0 For Jailbreakers & Unlockers You can jailbreak i Phone 4.0 OS with redsn0w 9.5.0 or download Pwnagetool 4.0 or by grabbing i Phone 4.0 custom firmware file from internet.
Please note in order to upgrade i Phone to firmware 4.0 you must have latest version of i Tunes software installed. Select your i Phone under Devices in the Source List on the left. In the i Phone Summary pane, click Check for Update. The unofficial Blacksn0w tool can unlock i Phone 4.0 on i Phone 3GS.
***Do NOT select the stock i OS IPSW or you’ll lose you unlock*** Once the restore process is complete, your i Phone 4/3GS will have a preserved baseband and now ready for the jailbreak and then unlock with Ultra Sn0w; Now you can unlock your i Phone 4 or i Phone 3GS with Ultra Sn0w or Gevey SIM on i OS 5 firmware; To jailbreak i Phone 4 or i Phone 3GS on i OS after preserving the baseband, Follow this: (how to jailbreak i OS with Red Sn0w) guide from Step 3.