firmware upgrade encountered an issue in GALAXY S2 i9100

after installing firmware xwkdd i had wipe the cache partition and factory data reset.. after doing this my galaxy s2 is not turning on, its restarting repeatedly. and now its says “firmware upgrade encountered an issue. please select recovery mode in kies and try again” and samsung kies does not recognized my galaxy s2 therefore my pc can recognized it.. plz plz plz help i am worried