Destroying bootloader

Sorry for the double post. was not sure how to get help. please forgive me.

I managed to find a compatible rom for my device.
https://drive.google.com/drive/folders/10h1VUoXn-vupFEbj1xSusJOjsWW7DxZ7

MXQ PRO 4k with p281 bootloader. Hope this helps anyone with the same problem