probleme upgrade hwk,plz help

Upgrade log:
---------- HWK upgrade started:17:23:47 ----------
-- Target Id : 62 CF 1 7
-- UFSx Boot : UFxBoot V2.2 (c) SarasSoft 2003.
-- UFSx Firmw.: UFS_USB V2.6 (c) SarasSoft 2005.
-- UFSx S/N : xxxxx
-- Features : 00000000
-- UFSx Vendor: TORNADO
-- HWK ID : A1.02-TEST-ADE4xxxxxxxxxxE
-- HWK Status : 1, DL: 0
----------
Locating HWK Upgrade server...
HWK Upgrade server found!
Preparing connection to server...
Connecting to HWKUpgrade server...
Server connection successfully established.
Authenticating on server...
Authentication stage error: Error: Server returned unrecognized reply

plz how to solve this probleme?:confused: