C399 flashing problem

Welcome to Octoplus/Octopus Box LG Software version 1.7.7

--------------------------------------------------------------------------------

Platform: LG MTK

Selected port: COM1

Selected baudrate: 921600

Selected model: C399

Selected USB connection type

Please, disconnect battery and connect cable...OK

Phone found.

Setting power state...OK

Sending loader...Failed!

via Welcome to gsm-tips http://ift.tt/1sa2AoJ