I need your help please

I have nokia lumia 521 rm 917 metro pcs and I need repair boot and I try with chimera and display this

[Lumia boot repair started.]

Downloading files
done.

Downloading files
done.

Downloading files
done.

Checking hex programmer.
done.

Downloading hex programmer.
Unable to send message to hex programmer.
Finished at local time: [01.16.16 10:50:37]
WorkID: 8827977