First: i managed to install the new uboot without serial cable using flash_erase /dev/mtd0 0 4 nandwrite /dev/mtd0 /tmp/uboot.mtd0.kwb-2011.12-L2Cdisabled-davysconfig nanddump -o -l 0x80000 -f /tmp/mtd0.uboot /dev/mtd0 && md5sum /tmp/mtd0.uboot md5sum /tmp/uboot.mtd0.kwb-2011.12-L2Cdisabled-davysconfig But my output still differs: U-Boot 2011.12 (Feb 12 2012 - 21:33:07) Seagaby avion23 - Debian