AX3500 Failed to Upgrade

Dear All,

I have an AX3500 controller, it was operating good until i want to upgrade it to 1.9V Firmware, from this URL,
dev.roboteq.com/dev1/index.php/legacy-mo...500-detail#resources

I used Roborun PC Utility to upgrade it, but I faced this error

Then i tried to run Roborun PC Utility again but it tell me that it recived bad data from controller, as photo shows:

please help me to solve this problem,

Regards.
jafar dawwd.