kathrein ufs 910 network problem

After install summer image 2011 flash , i can't change parameter in
network setup, use interface ------no.
I change it to "yes", but it always is return to "no" and i have no network.
I tried with manual settings ip(use dhcp or no) same thing is happening.
Now i can't see kathy over ftp or MPI .
When i use AAF_Recovery_tool i have :
Recovery for UFS910
Ping ServerIP ( 192.168.1.99 )... Done
Ping to serverIP (PC) Failed !!!
My current settings is
192.168.1.25 ufs
192.168.1.1 gateway
192.168.1.99 this pc , firewall is disabled
and if i change ip always same "Ping to serverIP (PC) Failed !!!"
I tried another PC and same result is happening.
What next, any suggestion ,help