sudo apt purge mali-fbdev
sudo apt install clinfo ocl-icd-libopencl1
cd ~
apt download mali-fbdev
ar -xv mali-fbdev_*
tar -xvf data.tar.xz 
rm usr/lib/aarch64-linux-gnu/libOpenCL.so*
sudo cp -r usr/* /usr/
mkdir -p /etc/OpenCL/vendors/
echo libmali.so | sudo tee /etc/OpenCL/vendors/mali.icd
rm ~/control.tar.xz ~/data.tar.xz ~/debian-binary ~/mali-fbdev_0.1-2_arm64.deb
rm -r ~/etc ~/usr