iphone 3gs not jailbreaked
 

hi .after upgrade my iphone 3gs with version 4.2.1
is not posible to jailbreak with limera and redsnow
i have to downgrade to version 4.1 and same problem
iphone has bb 05.15.04 bootloader 6.4 model mc 131
any help please.best regards.klodi

try this metohd working 4 me every time
 

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restore your iphone with 4.2.1
2:Open Redsnow redsn0w_win_0.9.6b6
3:Select Original 3GS Firmware iPhone2,1_4.2.1_8C148a_Restore
4: The New Message Box Will Pop up so Click YES ad select install just cydia
after jailbeal your iphone stuck in aple logo no prblem and dont try to flash again just do with redsnow shose JUST BOOT TETHERED RIGHT NOW option and wait for boot .and power norman ,then go to cydia instal ,source and add repo666.ultrasnow.com insttal it now iphone ask to reboot .accept after reboting iphone stuck in aple logo yu need to open redsnow shose JUST BOOT TETHERED RIGHT NOW option .after that your iphone work normantly

thanks for your help.after use this method iphone is jailbreaked and installed ultrasnow v1.2
but no network and if i reboot my iphone only with redsnow (JUST BOOT TETHERED RIGHT NOW) is possible to power in normally mode

now i have upgarde baseband but same problem no service