Please make sure you use the latest image, if not please follow Upgrade The System to upgrade your system.
Please check PPSSPP.
As PPSSPP depends on SDL2 Mali Library, so please follow SDL2 Mali Library Installation to install SDL2 Mali Library before install PPSSPP.
$ mkdir /tmp/ppsspp $ cd /tmp/ppsspp $ wget https://dl.khadas.com/repos/debs/vim3/focal/ppsspp/ppsspp.tgz $ tar xvzf ppsspp.tgz $ cd ppsspp $ sudo dpkg -i *.deb
Run launch_ppsspp.sh to launch PPSSPP.
$ launch_ppsspp.sh