I have problem with bed blocks

[dgin]

Hi, I have many bed blocks in to nand flash.
When I press "f" or "nand scrub" for formating nand flash, I have message:
Enter your Selection:f

NAND scrub: device 0 whole chip

Warning: scrub option will erase all factory set bad blocks!

There is no reliable way to recover them.

Use this command only for testing purposes if you

are sure of what you are doing!


Really scrub this NAND flash? <y/N>

When I press "y", I have message:
scrub aborted

What I have to do?

[esky-sh]

what is your boot mode for u-boot? nor boot or nand boot?

[dgin]

I understood. For formatting nand flash, after pressure "y" I had to press "enter"