Ok heres the dummies guide to jailbreaking iphone 4 on 4.2.1
Download greenpoision somehow and follow all the steps... DO NOT LET GO OF THE HOME BUTTON UNTIL YOUR PHONE COMPLETELY REBOOTS.
If loader does not open...
Download 4.2.1 software from online and red snow 0.9.6 rc8
Run red snow BEFORE OR AFTER greenpoision JB and only check install cydia...
run the program and bam shakalaka your done...
PS. Still by far the ********* jailbreak around
Download greenpoision somehow and follow all the steps... DO NOT LET GO OF THE HOME BUTTON UNTIL YOUR PHONE COMPLETELY REBOOTS.
If loader does not open...
Download 4.2.1 software from online and red snow 0.9.6 rc8
Run red snow BEFORE OR AFTER greenpoision JB and only check install cydia...
run the program and bam shakalaka your done...
PS. Still by far the ********* jailbreak around