Uboot update failed

There is a problem with UBoot update. If I’m performing all steps as it is said in U-Boot Reference Manual, then I can’t update my UBoot.

UBoot version:
CCW9C # version

U-Boot 1.1.4 (Jun 13 2007 - 19:36:49) DUB-RevC
for Digi ConnectCore Wi-9C on Development Board

Terminal printout:
CCW9C # update uboot tftp
TFTP from server 192.168.205.111; our IP address is 192.168.205.10
Filename ‘u-boot-ccw9cjsnand.bin’.
Load address: 0x200000
Loading: ###########################################
done
Bytes transferred = 217996 (3538c hex)
Automatic boot of image at addr 0x00200000 …

Booting image at 00200000 …

Bad Magic Number
command tftp 0x200000 u-boot-ccw9cjsnand.bin failed

So, how I could update UBoot from TFTP?

R.T.

SOLVED.

The problem was in autostart env. This env should set to no:

setenv autostart no