20.1-Nexus on K II Pro

Hi, Colleagues I got a box K II pro with AlexElec installed, and I want to have Coreelec.
I downloaded 20.1-Nexus (Stable) burned the image to a flash drive, changed gxl_p230_k2_pro_100mbit to dtb.img and unfortunately the box resets on startup after several seconds of booting.
Can you help me install Coreelec on my box ?
Thank you for your help.

try gxl_p230.dtb