i have an unlocked iphone 3gs with ios 4.2.1 (tethered unlock). I want to update the iphone to the untethered version of ios 4.2.1. I have to use redsn0w "just boot tethered now" option to restart my iphone.
Version: 4.2.1 (8c148a)
Firmware: 06.15.00
Can someone please help!!!!