Hello, LAVA Team!

I have question about device description.
I have problems with pre_power_command
If I don't use requests : pre_power_command in my job description, i get error, that no request implementation. 

So in my case, I need to switch device to fastboot mode by sending command via serial connection. And I decided, that pre_power_command is better solution for me. Cause before fastboot deploying by setting up this command I will switch device's mode. 

And here I stuck, cause  I received error message: 
no pre_power_command implementation.

Device description:
https://pastebin.com/FLhGUnyH

Job description:
https://pastebin.com/Ts6VUXZe

Error log:
https://pastebin.com/9jXvjxZb

best regards, Ilya