Custom shader dissappear on mobile

Hi! I have a line renderer in my game and I made a custom shader on it for its to look like laser. I tested the game on so many phones, virtual devices etc. It works fine except General Mobile 4G Dual. On that phone the shader just not showing up, its invisible.

Laser is the main mechanic in my game so i need to solve this problem. Has anyone have an idea for this issue?

I added screen shots of shaders graph.

Also phone's model: General Mobile 4G Dual

Android version: 7.1.1

more details: https://www.generalmobile.com/products/GM4G

part2 of the shaders graph in the reply below: