Posted by: alece December 3, 2010
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dude m talking about the modem firmware!!check what firmware are u in ??it's just that if it is in 05.14.02 u will have to upgrade the baseband. one u said 4.0.1 is software version. u can go to store to fix the power button will cost like 40 bucks i think but if u want to do without fixing it !!using power n home is about getting ur phone to DFU mode so that u will be able to restore and downgrade. here it goes : download the link n follow the instructions:(not tried this but i guess it works)
2.) Extract the archive to the root of your hard drive, should be C:/DFU/
3.) Connect your iPhone and ignore iTunes
4.) Goto Start – run
5.) Next type in “c:/dfu/dfu iBSS.m68ap.RELEASE.dfu”
6.) Wait for iPhone to show a “white” screen
7.) Now you may proceed to downgrade!
and yeah after u jailbreak be sure to check the modem firmware!!!! it it's showing no sim then it's possibly because of the firmware!!!!and what are you using ?u will have to have the latest redsnow !!!or i suggest you to to use pwange tool!!!!once you get to dfu mode !!!!start redsnow or pwange as u wish!!!(keep trying !!jailbreaking is fun!!)
if u still have problems hit me up!!!!