Can I use redsn0w 0.9.10b3 to jailbreake iOS 4.2.1?

redsn0w 0.9.10b3 ios5.
can use redsn0w 0.9.10b3 update iphone 4 ios 4.1 4.2.1 preserving baseband unlock , jailbreak4.2.1with?.i don't want upgrade ios5 @ moment! please me q....

 

no redsn0w made 5.01

can jailbreak 4.2.1 jailbreakme.com

go jailbreakme.com on mobile safari on phone , free ip4!

 

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