If you get log, like
panthor fb000000.gpu-panthor: [drm] *ERROR* Failed to load firmware image 'mali_csffw.bin
Solution 
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Check whether Firmware file is located on below location
ls /lib/firmware/arm/mali/arch10.8/mali_csffw.bin
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Run below command
lsinitramfs /boot/initrd.img-6.1.75-axon | grep -i mali
Output :
vicharak@vicharak:~$ lsinitramfs /boot/initrd.img-6.1.75-axon | grep -i mali_csffw.bin usr/lib/firmware/arm/mali/arch10.8/mali_csffw.bin.zst
If output contains mali_csffw.bin.zst file then delete it using
sudo rm -rf usr/lib/firmware/arm/mali/arch10.8/mali_csffw.bin.zst
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sudo update-initramfs -u
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sudo reboot