2.3.6 root info
tried many methods, here're my results, hope this helps...
going from gb 2.3.3 rooted with cf root ...to 2.3.6 with cf root.
(all firmware from "check fus 2.1")
uk(02)...JQ8 -not easy!
eventual success, method mentioned in last page of link
Poland play... JQ9 -easy!!
used pc version 'odin3 v1.7' to flash firmware, then again to flash 'cf root kernel' (same one as in the above 'xda' link).
result -all good
tried using mobile odin pro first but had probs.
if all else fails, you could try, team overcome's custom rom, i tried that too but didn't like their version of cwm, so was determined to get chainfire's original working.