Have you installed the Maz-X Barebones shader on your device? Let us know how it runs on your specific phone model in the comments below
Because Barebones shaders focus on texture replacement and color maps rather than volumetric lighting or raytracing, they do not trigger the Render Dragon "shader lock." You can use this file safely on any official Minecraft version without being banned or requiring a third-party launcher. File name- Maz-X-Barebones-Shader-MCPE-1.21.mcpack