if you s-off your device, now you need to flash 3.33 universal firmware , here is a guide from that
http://xdaforums.com/showthread.php?t=1459767 read the steps carefull and check md5 sum important , after that you'll need to flash recovery 4ext 1.0.0.6 RC1 via fastboot.. and after that you'll be able to flash custom roms
(btw do you have fastboot and adb files)?
EDIT1: if you have adb and fastboot here is the recovery you need to flash
https://www.dropbox.com/s/1a2o89surz0h7hj/4EXT_Recovery_Touch_v1.0.0.6_RC1.zip this is the lattest and here is guide how to flash it after upgrading you firmware , just
step 2 http://xdaforums.com/showthread.php?t=1631861 and you are done after that choose what rom you want transfer to you sd card , before flashing
format all paticion except sd card and flash the rom you want