restore default image

Nick
Hello,

I'm trying to restore to factory defaults my MINI2440, but on the first
step, something is strange.... this is the menu

##### FriendlyARM BIOS 2.0 for 2440 #####

[x] format NAND FLASH for Linux
[v] Download vivi 
[k] Download linux kernel 
[y] Download root_yaffs image 
[a] Absolute User Application
[n] Download Nboot for WinCE 
[l] Download WinCE boot-logo
[w] Download WinCE NK.bin 
[d] Download & Run 
[z] Download zImage into RAM 
[g] Boot linux from RAM 
[f] Format the nand flash 
[b] Boot the system 
[s] Set the boot parameters 
[u] Backup NAND Flash to HOST through USB(upload) 
[r] Restore NAND Flash from HOST through USB 
[q] Goto shell of vivi 
[i] Version: 1026-2K

Enter your selection: 

but when i select "x", it give me this message:

Enter your selection: x
Found block size = 0x00020000
Erasing...    ... done
Writing...    ... done
Written 49152 bytes
Saved vivi private data

there are no partition like in the instruction?
after i try to download supervivi, zimage and root_default.img but it
doesn't work

How can i do?