Issue from RockPi 4B+ With Waveshare 3.5 SPI TFT LCD DIsplay

[XarlesEHeat]

I've installed this display onto my Rock Pi 4B+ computer, but i am not able to show any image through the display. Following the tutorial at here bricked my system to the point i had to acces the SD card to remove all the changes i did in order to recover the OS. Also, installing the Matchbox keyboard didn't worked either, as i don't see such keyboard anywhere unless i open it manually from the menu.

I'd like to have the same video output on both the display and the HDMI, maybe, to move the desktop from the display to the HDMI if that's easier to do. Mind to give me a hand? TIA

This was my 20-modesetting.conf file