When I connect phone to HWK box, I can flash phone but got the same problems with phone, but when I check gdfs info I've got error:

CSETUP GDFS INFO
U_LOCK : 0000
CXC_NR : cxc1250324 R4ED001
CDA_NR : CDA102494/44 R1A
Country: EUROPE_5
JAVA : Java/SEMC-Java/2.0 Profile/MIDP-2.0 Configuration/CLDC-1.1
Modem : Sony Ericsson W810 IrDA Modem,Sony Ericsson USB WM
ITP_SW : CXC 125 0326 R1E
KRH_Inf: BD30513E87
ERR_Log: 1E5W

maybe it will help?