flashcp failed (bad block)?

[Arno Steffen]

I used the mtd-utils to flash a partition on my system on a running
linux. This time I get an error:

flashcp -v /tmp/mtd5 /dev/mtd5
Erasing blocks: 24/320 (7%)
While erasing blocks 0x002e0000-0x00300000 on /dev/mtd5: Input/output error

So I tried to erase the partition:

flash_eraseall -j /dev/mtd5
Erasing 128 Kibyte @ 2c0000 --  6 % complete.
Skipping bad block at 0x002e0000
Erasing 128 Kibyte @ 27e0000 -- 99 % complete.

Until now I have been sure that flashcp can handle bad blocks? Am I wrong?
What can I do?

flashcp works with same image file on other partition /dev/mtd6 which
have the same size.

Best regards
Arno