...try to use baudrate 115200 bauds with X65Flasher or Papuautils. Because you have ELF1 bootcore, you need use fullflash with the same type (normal flashing - without bootcore); flash with the EL71 fullflash (and write bootcore using x65flasher /b with the DOS command), or change manually bootcore name and force writing new flash with the SWUP firmware. One suggestion:
not use write "new bootcore" option from Papuautils, because you don't have possibility in the future to make in the good condition the other fullflash or firmware upgrade. See bellow how to change bootcore in the good condition:
http://forum.gsmhosting.com/vbb/showthread.php?t=395620
dagos