there is a simple way to update to iOS 4.3 without basebande update with Pwnagetool 4.3 or Sn0wbreeze 2.3b4 . easy unlock and jailbreak But its need you have 05.13.04 bb or below. Its a tethered jailbreak for iPhone 4 and iPhone 3Gs new bootrom but it is UNTETHERED jailberak for iPhone 3Gs old Bootrom.
Tools needed
1 . Custom firmware for Device :
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Download custom firmware iPhone 4 /Actived
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Download custom firmware iPhone 3Gs old bootrom /Actived
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Download custom firmware iPhone 3Gs new bootrom /Actived
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2- iREB R4
3- Download iBooty :
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Guide :
1. Connect your phone with PC and switch off
2. Open iREB r4 and follow olders
3-After that open itunes and press “Shift + Restore” and choose custom firmware 4.3
it will finish very quickly
4-Finally you can see your phones is with your old Baseband. now just you can install the ultrasn0w 1.2 from Cydia
5- use iBooty for boot your device if its tethered iOS 4.3 jailberak
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