Hello, i found a methode, which let you preversing the iPhone4 Baseband Update! 1) Make sure sauriks server is in etc/hosts 2) Shift Click in iTunes "Update Firmware", choose your 4.2.1 FW. 3) When its done, you get Error "1013" 4) Open latest Tinyumbrella Version => Choose "KICK OUT OF RECOVERY" 5) Done, 4.2.1 with old baseband
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