SamyGO

Hi,
I cant find your fw image at net. Can you leave link for that FW.
But I think you can modify your FW with SamyGO Firmware Patch for enable telnet.
Or you can use Samygo Telnet Enabler Application for enable it.
Afterwards you can mount NFS or Samba shares as you want.

I mean where can I download last LNxxB640 Firmware?
There is no link that I found at Samsung USA.

Did you try the Telnet Enabler Application? I think It will work for you too.

Himm, thats bad. Only option is using exlink cable:
1) to get in to linux shell.
2) copy current exe.img partition to usb drive.
3) make modifications to that image by hand.
4) and burn that modificated exe.img to TV again.

Wiki will help you in each step.

It's really really easy to make exLink cable if you can solder some things. But ordering one is cheap too I think. Once you have it, we will give support, when you ready