unable toflash ms500

Checking data…OK
Platform: LG Qualcomm
Selected port: COM249
Selected model: MS500
Reading info…
Model ID: LGMS500-00-MS50012b-TMO-US-MAR-24-20140
IMEI:
Android version:
Battery level: 51%
Mode: Emergency
Model ID: BS/LGMS500/214054
SW version: LGMS500AT-02-V12b-310-260-MAR-24-2014+0
Product ID: CT69S140521000606
IMEI: 013758-00-844335-8
Opening "new.oct"…OK
Initializing flash…OK
Testing connection…OK
Writing PrimaryGPT…Failed!
Error code: ZXLCALSZXD