Default [HELP] Serious problem, my phone is almost bricked

Hi everyone,my phone is LS995, i changed a whole file build.prop in /system to another file from lg g2. Now my phone can not be

flashed by lg flashtool( different model even though i have used lgup_4879.dll file).

The only thing i can do is boot to stock recovery mode and flash by adb sideload. I have tried all the solutiions but still no luck. I need an file that i can flash by adb to replace the original build.prop. Anyone pls help me to save my phone. Thanks