IPGuru

oops , AT-X is only needed to erase the BIN file & is not needed to default a system.

Back to Basics time

set PC IP address to 192.168.42.x
open manager
set manager to BROAD CAST address ( file preferences/edit)
make sure the the bin directory is pointed to the corect location of the bin files
(file/cjhange working directory)

add bootp entry for system as follows

Mac - Mac address of system
IP Address : 192.168.42.1
firl name - ip403.bin

if you are using 2.1 also make sure thet the bootp entry is enabled

Reboot system

if the system has been fully erased as you said & all the above information is correct then this WILL recover the unit.

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Universal Plan B: - When all else fails CHEAT!