The GDFS contains calibration data of your phone. The phone is not able to boot up if the GDFS is bricked.
Unfortunately there is no free/cracked software available to revive the W300's GDFS.
A GDFS is unique to the phone, you can't flash another GDFS to it unless it's your own.
At least not if you don't own the soft-/hardware to do it.

I just read through your other thread. I really don't know what to do right now.
You should try to write EROM, do a fullflash and then write back the backup of your GDFS. But I think you've already done that so...:confused: