Thank you very much for this! I took hours trying to make YSMenu work on my R4 for ONE game, the new Taiko, and it didn't even worked... I downloaded this, put it on my R4, and it worked perfectly!
Not sure about other models of Pi4 but the Pi 4 B with 8GBs OCed to 2Ghz handles PSP really great except like 1 game I found and it is playable it just looks bad lol Motor Storm Arctic something or other.