iPhone 3GS suck in DFU mode

I wanted to update my iPhone 3GS from 3.1.3 to 4.2.1 so then I followed

METHOD: First use Redsn0w 0.9.6b6 to put your iPhone in Pwned DFU mode so that it is able to accept Custom Firmware file. When iDevice in Pwned DFU mode then simply open iTunes and hit Shift + Restore (Windows) or Option key + Restore (MAC) and load in Custom 4.2.1.

Onces all the proccess was done iPhone did not reboot but went straight into recovery mode.

so to take it out off recovery mode I used Tinyumberalla which gave me an option "Fix Recovery"

When I click on Fix Recovery it did its thing on the phone and gave me a message
Unable to find gBdevlist
unable to find fs_mount
Unable to find fs_unmount
Unable to find fs_load_file
Greenpoision Initialized

and then does some more things again and stops at
Unable to mount user filesystem!
AppleBCMWLAN: :handleIOKitBusyWatchdogTim
eout():Error,no successful firmware do
wnload after 60000 ms!! Giving up....

I dont no what to do Please Help.

 

It does not let me click on Exit recovery it is not highlighted.

 

No its black screen but when i turn on my itunes it says that my phone is in recovery mode
but when i try to do anything like putting a fresh ipsw or custome ipsw it wont let me.