No you can't ... You need older version(much older than 2.7.4) to root it.
My advice is ,flash latest stock rom XWJWB 2.3.6 then do not root it 'cause jwb's kernel is much newer than 2.7.4's... (Sema. 2.7.4 is JW5 based) and firmware releases by date (older to newer);
JW4 April 2012
JW5 April 2012 (Semaphore kernel based on this)
And JWB(February 2013)
Currently there is no official cf root for jwb but i saw unoffical one...If you really need root (really) i'll test than one and give a feedback
GT-I9000 cihazımdan Tapatalk 2 ile gönderildi