Problem flashing Board SW to VNS-L21

When I'm trying to flash board SW (VNS-DL00_L21_L31_Board Software) using testpoint mode (HUAWEI USB COM 1.0) I'm getting this error:

HUAWEI USB COM 1.0 (COM146), Provider: HUAWEI Incorporated, Driver ver.: 2.0.6.725, Date: 6.11.2015, USB\VID_12D1&PID_3609&REV_0100
Repairing...HL2VENUSMAA001052.skf
Writing flash...ptable...OK
Writing flash...xloader...OK
Writing flash...fastboot..flash write prim vrl failure


Can someone help me pls?