Recovery from Custumize Image (Linux)

I right now completed it while building up custumize Image (include:
u-boot.bin, ZImage,root_qtopia.img). However, when i recovery to the board
following to Mini2440-UserManual, it still gets errors. Can you help me to
fix that?

try to partition the Nand flash (x) bon par and re-load the back-up Nand
flash.

But it still error! Please tell me step by step to fix it! Thanks

Have a look in the "Linux Download Manual" under
http://www.friendlyarm.net/downloads