To extract firmware for Kworld UB499-2T (id 1b80:e409) you need to copy the
  following file(s) to this directory.
  
  IT9135BDA.sys Dated Mon 22 Mar 2010 02:20:08 GMT
  
  extract using dd
  dd if=IT9135BDA.sys ibs=1 skip=69632 count=5731 of=dvb-usb-it9137-01.fw
  
  copy to default firmware location.