Hi, noob here, first post on xda, hope this helps
i had the same problem, trying to intall superjellybean 6 and fusion 5.4 kernel from the rom thread on my unlocked BL rooted ArcS with XperiaUltimateHD and Lupus kernel. Got stuck on fusion kernel logo after flashing it following the guide in superjellybean thread. I think the problem come from flashing a JB kernel on a ICS rom.
Mine is working now (notice that is unlocked BL), this is what i've done
flash via flashtool the LT18i_4.1.B.0.587_(1254-2184), then oneclick root the device again using Eroot_v1.3.4 from this thread
using flashtool flash a lupus ics kernel for having the CWM back.
reboot to CWM recovery and do the wipes and flash the zips Superjellybean 6 and google apps, on the ics kernel. the device still won't boot.
from flashtool reboot to fastboot mode and flash a JB kernel (i used Lupus jb).
reboot and good luck