Where to put this autostart.sh to prevent RGB FLICKERING

Hi,

I have an old Philips TV, that sometimes turns screen into green/pink screen.

I have found a solution here somewhere where they use SSH and send this code to the libreelec.

And frankly it works well.

#!/bin/sh 

echo 1 > /sys/class/amhdmitx/amhdmitx0/output_rgb

However I was wondering whether can I paste this code, so libreelec can do this automatically after a reboot.

Thnx

I have h96+ Pro box s912, with 3gigb that runs on preview LE8.0 L version of @kszag