LG m210 unlock failed same error on 2 phones

LG 2-3G Tool v9.51
supported models: 1556

Mode: Normal
Model: LGM210AT
Build version: Oct 19 201716:21:56May 27 201713:00:00LGM210AT
SW Version: MPSS.JO.2.0.c1.2-00031-8937_GENNS_PACK-1
IMEI: 35366108798967-1
BlueTooth Address: 00:00:00:00:00:00
Phone Code:
Elapsed: 1 secs. --> (v9.51)

Checking Login and Password... OK
Ballance: 30 crd.
You have 30 credit(s) left. This operation takes 10 credits.Continue? Yes
Searching modem interface... found COM554
Reading data from phone... OK
IMEI: 353661087989671
Checking root rights... OK
Writing zTool... OK
SW Version: M21010s
Initialization zTool... (this can take 1-2 minutes) OK
Reading data from phone... error(0)


then i get access violation on software