You can use ATools and use it to update your kernel.
Galaxy S II [i777] > ROM: SHOstock3 Latest Released!!! [Got My Jelly Bean as of 1/29/2013]
Retired Phone: G1 Black 32B (unlocked) on AT&T
| (Bricked as of 11/1/2011 [Due to my $tuP!t!d!ty for not using fastboot WARNING])
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